L-6 » Optics- MCQs (12th) | Physics | Objective Questions- 12th

Multiple Choice

ID- 15924

BSEB, 2019 (C)

1. Brewster's law is:

(A) μ = sin $\ce{i_p}$
(B) μ = tan $\ce{i_p}$
(C) μ = cos $\ce{i_p}$
(D) μ = cot $\ce{i_p}$

Oct 23, 2022 at 06:40 AM

Multiple Choice

ID- 15925

BSEB, 2019 (C)

2. The magnifying power of a compound microscope for normal adjustment is:

(A) $\frac{v_0}{u_0}1+(\frac{D}{fe})$
(B) –$\frac{v_0}{u_0}(1+\frac{D}{fe})$
(C) $\frac{u_0}{v_0}(1+\frac{D}{fe})$
(D) $\frac{v_0}{u_0} + \frac{fe}{D}$

Oct 23, 2022 at 06:52 AM

Multiple Choice

ID- 15926

BSEB, 2019 (C)

3. Path difference in destructive interference is equal to:

(A) (n + 1)λ
(B) (2n + 1)λ
(C) (2n + 1)$\frac{λ}{2}$
(D) $(\frac{n + 1}{λ})$

Oct 23, 2022 at 06:53 AM

Multiple Choice

ID- 15927

BSEB, 2019 (C)

4. When light enters from one medium into another medium, which quantity does not change?

(A) Wavelength
(B) Frequency
(C) Speed
(D) Amplitude

Oct 23, 2022 at 06:55 AM

Multiple Choice

ID- 15928

BSEB, 2019 (C)

5. When we see an object, then the image formed on retina is:

(A) real and erect
(B) real and inverted
(C) virtual and erect
(D) virtual and inverted

Oct 23, 2022 at 06:56 AM

Multiple Choice

ID- 15929

BSEB, 2020 (A)

6. On reasing the length of the tube of compound microscope, magnifying power:

(A) increases
(B) decreases
(C) does not charge
(D) becomes zero

Oct 23, 2022 at 07:02 AM

Multiple Choice

ID- 15930

BSEB, 2020 (A)

7. The velocity of light is maximum in:

(A) air
(B) glass
(C) water
(D) vacuum

Oct 23, 2022 at 07:05 AM

Multiple Choice

ID- 15931

BSEB, 2020 (A)

8. Which of the relations is correct for the magnifying power of compound microscope?

(A) $\ce{M = – \frac{L}{fo}(1 + \frac{D}{fe})}$
(B) $\ce{M = – \frac{fo}{L}(1 + \frac{D}{fe})}$
(C) $\ce{M = (1 + \frac{D}{fe})}$
(D) $\ce{M = (1 – \frac{D}{fe})}$

Oct 23, 2022 at 07:09 AM

Multiple Choice

ID- 15932

BSEB, 2020 (A)

9. Optical path is equal to:

(A) refractive index x path-length
(B) refractive index / path-length
(C) path-length / refractive index
(D) refractive index x $\ce{\frac{path-length}{2}}$

Oct 23, 2022 at 07:12 AM

Multiple Choice

ID- 15933

BSEB, 2020 (A)

10. The lens which is used to remove short sightedness is:

(A) concave
(B) convex
(C) cylindrical
(D) plano-convex

Oct 23, 2022 at 07:14 AM

Multiple Choice

ID- 15934

BSEB, 2011

11. The radius of curvature of plane mirror is:

(A) Infinite
(B) Zero
(C) +5 cm
(D) –5 cm

Oct 23, 2022 at 07:15 AM

Multiple Choice

ID- 15935

BSEB, 2011

12. SI unit of power of a lens is:

(A) Joule
(B) Dioptre
(C) Candela
(D) Watt

Oct 23, 2022 at 07:16 AM

Multiple Choice

ID- 15936

BSEB, 2012

13. The magnifying power of magnifying glass of power 12 diopter is:

(A) 4
(B) 1200
(C) 3
(D) 25

Oct 23, 2022 at 07:17 AM

Multiple Choice

ID- 15937

BSEB, 2012

14. A biconvex lens (μ = 1.5) has equal curvature each of 20 cm. The power of the lense is:

(A) 5D
(B) 10D
(C) 2.5D
(D) 20D

Oct 23, 2022 at 07:20 AM

Multiple Choice

ID- 15938

BSEB, 2015

15. When two converging lenses of same focal length $f$ are placed in contact, then the focal length of the combination is:

(A) $f$
(B) 2$f$
(C) $\frac{f}{2}$
(D) 3$f$

Oct 23, 2022 at 07:22 AM

Multiple Choice

ID- 15939

BSEB, 2013, 2015, 2016

16. When a ray of light enters a glass slab, it's wavelength:

(A) increase
(B) decrease
(C) remains unchanged
(D) date are not complete

Oct 23, 2022 at 07:24 AM

Multiple Choice

ID- 15940

BSEB, 2015

17. The transerve nature of light wave supports:

(A) interference
(B) reflection
(C) polarisation
(D) dispersion

Oct 23, 2022 at 07:25 AM

Multiple Choice

ID- 15941

BSEB, 2015, 2017 (C)

18. The colour of thin film is due to:

(A) Scattering
(B) Interference
(C) Dispersion
(D) Diffraction

Oct 23, 2022 at 07:27 AM

Multiple Choice

ID- 15942

BSEB, 2021 (A)

19. Power of parallel sided glass-slab is:

(A) infinity
(B) zero
(C) 100 cm
(D) 10 cm

Oct 23, 2022 at 07:28 AM

Multiple Choice

ID- 15943

BSEB, 2021 (A)

20. Which of the following is correct for refractive index of mean colour (yellow colour)?

(A) $μ = \frac{μ_r + μ_v}{2}$
(B) $μ = \frac{μ_r – μ_v}{2}$
(C) $μ = \frac{μ_r}{2}$
(D) $μ = \frac{μ_v}{2}$

Oct 23, 2022 at 07:34 AM

Multiple Choice

ID- 15944

BSEB, 2021 (A)

21. Which of the following is correct for Astronomical telescope?

(A) $f_o = f_e$
(B) $f_o > f_e$
(C) $f_o < f_e$
(D) $f_o << f_e$

Oct 23, 2022 at 07:37 AM

Multiple Choice

ID- 15945

BSEB, 2021 (A)

22. Angular dispersion is equal to:

(A) $(μ_v – μ_r)A$
(B) $(μ_v – μ_r)$
(C) $(μ_v + μ_r)$
(D) $(μ_v + μ_r)A$

Oct 23, 2022 at 05:19 PM

Multiple Choice

ID- 15946

BSEB, 2020 (A)

23. Width of interference fringe β:

(A) $β = \frac{Dλ}{d}$
(B) $β = \frac{d}{Dλ}$
(C) $β = \frac{dλ}{D}$
(D) $B = d.Dλ$

Oct 23, 2022 at 05:23 PM

Multiple Choice

ID- 15947

BSEB, 2021 (A)

24. A unit of which physical quantity is light year?

(A) Distance
(B) Time
(C) Energy
(D) Intensity of light

Oct 23, 2022 at 05:25 PM

Multiple Choice

ID- 15948

BSEB, 2018 (A)

25. Mirage is a phenomenon due to:

(A) refraction of light
(B) reflection of light
(C) total internal reflection of light
(D) diffraction of light

Oct 23, 2022 at 05:26 PM

Multiple Choice

ID- 15949

26. A ray of light incident at an angle $i$ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is:

(A) 7.5°
(B) 5°
(C) 15°
(D) 2.5°

Oct 23, 2022 at 05:29 PM

Multiple Choice

ID- 15950

27. A small telescope has an objective lens of focal length 144 cm and an eye piece of focal length 6.0 cm. What is the separation between the objective and the eye piece?

(A) 0.75 m
(B) 1.38 m
(C) 1.0 m
(D) 1.5 m

Oct 23, 2022 at 05:31 PM

Multiple Choice

ID- 15951

BSEB, 2021 (A)

28. Which of the following eye defects is removed by convex lens?

(A) Nearsightedness
(B) Farsightedness
(C) Presbyopia
(D) Astigmatism

Oct 23, 2022 at 05:32 PM

Multiple Choice

ID- 15952

BSEB, 2021 (A)

29. Which of the following relations is correct for dispersive power?

(A) $w = \frac{μ_v – μ_r}{μ_y –1}$
(B) $w = (μ_v – μ_r)(μ_y –1)$
(C) $w = \frac{μ_y –1}{μ_v – μ_r}$
(D) $w = \frac{μ_v · μ_r}{μ_y –1}$

Oct 23, 2022 at 05:36 PM

Multiple Choice

ID- 15953

30. The distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. What should be the focal length of the spectacles?

(A) 25 cm
(B) 50 cm
(C) 75 cm
(D) 100 cm

Oct 23, 2022 at 05:38 PM

Multiple Choice

ID- 15954

31. Which of the following colours of white light deviated most when passes through a prism?

(A) Red light
(B) Violet light
(C) Yellow light
(D) Both A and B

Oct 23, 2022 at 05:40 PM

Multiple Choice

ID- 15955

BSEB, 2020 (A)

32. The power of convex lens of focal length 20 cm in dioptre is:

(A) 4
(B) 5
(C) 3
(D) 2

Oct 23, 2022 at 05:41 PM

Multiple Choice

ID- 15956

33. The nearer point of hypermetropic eye is 40 cm. The lens to be used for its correction should have the power:

(A) + 1.5 D
(B) – 1.5 D
(C) + 2.5 D
(D) + 0.5 D

Oct 23, 2022 at 05:42 PM

Multiple Choice

ID- 15957

34. The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is:

(A) $\frac{3}{2}$
(B) $\frac{4}{3}$
(C) $\frac{9}{8}$
(D) $\frac{5}{3}$

Oct 23, 2022 at 05:46 PM

Multiple Choice

ID- 15958

35. What can be the largest distance of an image of a real object from a convex mirror of radius of curvature is 20 cm?

(A) 10 cm
(B) 20 cm
(C) Infinity
(D) Zero

Oct 23, 2022 at 05:48 PM

Multiple Choice

ID- 15959

36. A small angle prism (μ = 1.62) gives a deviation of 4.8°. The angle of prism is:

(A) 5°
(B) 6.36°
(C) 3°
(D) 7.74°

Oct 23, 2022 at 05:49 PM

Multiple Choice

ID- 15960

BSEB, 2018 (C)

37. A ray of light gets incident on a transparent material's slab at an angle of incidence 60°. If the reflected and the refracted rays are perpendicular to each other, than which of the given option (s) is (are) correct:

(A) Angle of refraction is 45°
(B) The angle of refraction is 30°
(C) The R.I. of materials of the slab is $\sqrt{3}$
(D) The R.I. of the materials of the slab is $\sqrt{2}$

Oct 23, 2022 at 05:54 PM

Multiple Choice

ID- 15961

38. A thin glass (refractive index 1.5) lens has optical power of –8 D in air. Its optical power in a liquid medium with refractive index 1.6 will be:

(A) 1 D
(B) – 1 D
(C) 25 D
(D) –25 D

Oct 23, 2022 at 05:56 PM

Multiple Choice

ID- 15962

39. Two mirrors at an angle θ° produce 5 images of a point. The number of images produced when θ is decreased to θ°–30° is:

(A) 9
(B) 10
(C) 11
(D) 12

Oct 23, 2022 at 05:58 PM

Multiple Choice

ID- 15963

40. Critical angle of glass is $θ_1$ and that of water is $θ_2$. The critical angle for water and glass surface would be $(μ_v = 3/2, μ_w = 4/3)$.

(A) less than $θ_2$
(B) between $θ_1$ and $θ_2$
(C) greater than $θ_2$
(D) less than $θ_1$

Oct 23, 2022 at 06:06 PM

Multiple Choice

ID- 15964

41. For a glass prism (μ = $\sqrt{3}$) the angle of minimum deviation is equal to the angle of the prism. The angle of the prism is:

(A) 45°
(B) 30°
(C) 90°
(D) 60°

Oct 23, 2022 at 06:08 PM

Multiple Choice

ID- 15965

42. Light travels in two media $A$ and $B$ with speeds 1.8 x $10^6$ $\ce{ms^{–1}}$ and 2.4 x $10^8$ $\ce{ms^{–1}}$ respectively. Then the critical angle between them is:

(A) $\ce{sin^{–1} (\frac{2}{3})}$
(B) $\ce{tan^{–1} (\frac{3}{4})}$
(C) $\ce{tan^{–1} (\frac{2}{3})}$
(D) $\ce{sin^{–1} (\frac{3}{4})}$

Oct 23, 2022 at 06:12 PM

Multiple Choice

ID- 15966

43. Difference objects at difference distances are seen by the eye. The parameter that remains constant is:

(A) the focal length of the eye lens
(B) the object distance from the eye lens
(C) the radii of curvature of the eye lens
(D) the image distance from the eye lens

Oct 23, 2022 at 06:15 PM

Multiple Choice

ID- 15967

BSEB, 2018 (A)

44. Critical angke of light going from medium (i) time (ii) is θ. The speed of light in median (i) is $v$, then the speed of light in medium (ii) is:

(A) $v$ $\ce{(1 –cos θ)}$
(B) $\frac{v}{\ce{sin θ}}$
(C) $\frac{v}{\ce{cos θ}}$
(D) $\frac{v}{\ce{(1 – sin θ)}}$

Oct 23, 2022 at 06:20 PM

Multiple Choice

ID- 15968

45. A real image of a distant object is formed by a planoconvex lens on its principal axis. Spherical aberration is:

(A) absent
(B) smaller, if the curved surfaces of the lens face the object
(C) smaller, if the place surface of the lens face the object
(D) same, whichever side of the lens faces the object

Oct 23, 2022 at 06:23 PM

Multiple Choice

ID- 15969

46. A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen:

(A) half the image will disappear
(B) complete image will disappear
(C) intensity of image will decrease
(D) intensity of image will increase

Oct 23, 2022 at 06:25 PM

Multiple Choice

ID- 15970

47. Which if the following forms a virtual and erect image for all positions of the object?

(A) Concave lens
(B) Concave mirror
(C) Convex mirror
(D) Both 'A' and 'C'

Oct 23, 2022 at 06:26 PM

Multiple Choice

ID- 15971

48. For a total internal reflection, which of the following is corect?

(A) Light travel from rarer to denser medium
(B) Light travel from denser to rarer medium
(C) Lights travels in air only
(D) Lights travels in water only

Oct 23, 2022 at 06:28 PM

Multiple Choice

ID- 15972

49. Two lenses of focal lengths 20 cm and –40 cm are held in contact. The image of an object at infinity will be formed by the combination at:

(A) 10 cm
(B) 20 cm
(C) 40 cm
(D) infinity

Oct 23, 2022 at 06:30 PM

Multiple Choice

ID- 15973

BSEB, 2016

50. The final image in an astronomical telescope with respect to object is:

(A) virtual and erect
(B) real and erect
(C) real and inverted
(D) virtual and inverted

Oct 23, 2022 at 06:32 PM

Multiple Choice

ID- 15974

51. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will:

(A) become zero
(B) become infinite
(C) become small, but non-zero
(D) remain unchanged

Oct 23, 2022 at 06:34 PM

Multiple Choice

ID- 15975

BSEB, 2018 (C)

52. A short pulse of white light is incident from air to glass slab at normally incidence. After travelling through the slab the first colour to emerge is:

(A) Blue
(B) Green
(C) Violet
(D) Red

Oct 23, 2022 at 06:37 PM

Multiple Choice

ID- 15976

53. Which of the following cannot be polarised?

(A) radiowaves
(B) transverse waves
(C) sound waves
(D) X-rays

Oct 23, 2022 at 06:38 PM

Multiple Choice

ID- 15977

54. If a mirror is approaching you at a speed of 10 $\ce{ms^{–1}}$, the speed with which your image approach you is:

(A) 10 $\ce{ms^{–1}}$
(B) 5 $\ce{ms^{–1}}$
(C) 20 $\ce{ms^{–1}}$
(D) 15 $\ce{ms^{–1}}$

Oct 23, 2022 at 06:43 PM

Multiple Choice

ID- 15978

55. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to water is:

(A) 8/9
(B) 9/8
(C) 7/6
(D) 2

Oct 23, 2022 at 06:46 PM

Multiple Choice

ID- 15979

56. The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:

(A) $\frac{1}{\sqrt{2}}$
(B) $\sqrt{2}$
(C) 1
(D) can't be determined

Oct 23, 2022 at 06:48 PM

Multiple Choice

ID- 15980

57. A concave mirror of focal length $f$ produced an image $n$ times the size of the object. If the image is real then the distance of the object is:

(A) $(n – 1) f$
(B) $(n + 1) f$
(C) $(\frac{n + 1}{n}) f$
(D) $(\frac{n – 1}{n}) f$

Oct 23, 2022 at 06:51 PM

Multiple Choice

ID- 15981

BSEB, 2019 (A)

58. Which one of the following has maximum refractive index?

(A) glass
(B) Water
(C) iron
(D) diamond

Oct 23, 2022 at 06:52 PM

Multiple Choice

ID- 15982

BSEB, 2019 (A), 2019 (C)

59. A convex lens $(n = 1.5)$ is immersed in water $(n = 1.33)$, then it will behave as a:

(A) Converging lens
(B) Diverging lens
(C) Prism
(D) Concave mirror

Oct 24, 2022 at 06:40 AM

Multiple Choice

ID- 15983

BSEB, 2019 (A)

60. Equivalent focal length of two lenses in contact having power –15 D and +5 D will be:

(A) –20 cm
(B) –10 cm
(C) +10 cm
(D) +20 cm

Oct 24, 2022 at 06:43 AM

Multiple Choice

ID- 15984

61. A convergent lens will become less convergent in:

(A) oil
(B) water
(C) both
(D) none

Oct 24, 2022 at 06:44 AM

Multiple Choice

ID- 15985

62. When light travels from one medium to another, which if the following does not change?

(A) frequency
(B) refractive index
(C) velocitt
(D) wavelength

Oct 24, 2022 at 06:46 AM

Multiple Choice

ID- 15986

63. Two lens power –15 D and +15 D are placed in contact coaxially. The focal length of equivalent lens is:

(A) –10 cm
(B) –20 cm
(C) +10 cm
(D) None

Oct 24, 2022 at 06:48 AM

Multiple Choice

ID- 15987

64. The air bubble inside water shine due to:

(A) Reflection
(B) Refraction
(C) T.I.R.
(D) None of these

Oct 24, 2022 at 06:49 AM

Multiple Choice

ID- 15988

65. When a ray of light (white) enters a lens, undergoes a change is:

(A) wavelength
(B) velocity
(C) frequency
(D) both velocity and wavelength

Oct 24, 2022 at 06:50 AM

Multiple Choice

ID- 15989

66. Radio waves from an antenna travel with the velocity of:

(A) light
(B) sound
(C) ultrasonics
(D) supersonics

Oct 24, 2022 at 06:52 AM

Multiple Choice

ID- 15990

BSEB, 2019 (A)

67. The magnifying power of an astronomical telescope for normal adjustment is:

(A) –$\frac{f_0}{f_e}$
(B) –$f_0$ x $f_e$
(C) $\frac{f_e}{f_0}$
(D) –$f_0 + f_e$

Oct 24, 2022 at 06:54 AM

Multiple Choice

ID- 15991

BSEB, 2019 (A), 2019 (C)

68. Cylindrical lenses are used to correct the eye defect called:

(A) myopia
(B) hypermetropic
(C) astigmatism
(D) presbyopia

Oct 24, 2022 at 06:56 AM

Multiple Choice

ID- 15992

BSEB, 2021 (A)

69. The image formed by simple microscope is:

(A) Virtual and erect
(B) Virtual and inverted
(C) Real and erect
(D) Real and inverted

Oct 24, 2022 at 06:57 AM

Multiple Choice

ID- 15993

BSEB, 2021 (A)

70. Focal length of eye-lens of a healthy man is about:

(A) 1 mm
(B) 2 cm
(C) 25 cm
(D) 1 m

Oct 24, 2022 at 06:59 AM

Multiple Choice

ID- 15994

BSEB, 2021 (A)

71. Velocity of light in vaccum is $c$. Its value in glass (μ = 3/2) will be:

(A) $\frac{3c}{2}$
(B) $\frac{2c}{3}$
(C) $\frac{4c}{3}$
(D) $\frac{c}{2}$

Oct 24, 2022 at 07:01 AM

Multiple Choice

ID- 15995

72. Which of the following is not essential for the formation of pure spectrum?

(A) parallel beam of light
(B) narrow beam of light
(C) screen
(D) prism in the minimum deviation position

Oct 24, 2022 at 07:03 AM

Multiple Choice

ID- 15996

73. Which produces additional luminiscene in a fluorescent tube:

(A) infra red rays
(B) ultraviolet rays
(C) micro waves
(D) radio waves

Oct 24, 2022 at 07:05 AM

Multiple Choice

ID- 15997

74. Far point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:

(A) 40 D
(B) –4 D
(C) –2.5 D
(D) –0.25 diopter

Oct 24, 2022 at 07:06 AM

Multiple Choice

ID- 15998

BSEB, 2021 (A)

75. The length of an astronomical telescope for normal adjustment is:

(A) $f_o – f_e$
(B) $f_o$ x $f_e$
(C) $\frac{f_o}{f_e}$
(D) $f_o + f_e$

Oct 24, 2022 at 07:08 AM

Multiple Choice

ID- 15999

BSEB, 2019 (A)

76. Light owes its colour to its:

(A) frequency
(B) velocity
(C) phase
(D) amplitude

Oct 24, 2022 at 07:09 AM

Multiple Choice

ID- 16000

77. The angle of deviation for a prism is greatest for:

(A) violet
(B) red
(C) orange
(D) yellow

Oct 24, 2022 at 07:10 AM

Multiple Choice

ID- 16001

78. A double convex air bubble in water behaves as:

(A) Convergrnt lens
(B) divergent lens
(C) plane slab
(D) concave mirror

Oct 24, 2022 at 07:12 AM

Multiple Choice

ID- 16002

BSEB, 2021 (A)

79. Interference of light is the redistribution of which of the following physics quantitics?

(A) Frequency
(B) Intensity
(C) Wavelength
(D) Speed

Oct 24, 2022 at 07:13 AM

Multiple Choice

ID- 16003

80. The colour of light that travels slowest through a glass prism is:

(A) red
(B) green
(C) violet
(D) yellow

Oct 24, 2022 at 07:14 AM

Multiple Choice

ID- 16004

BSEB, 2018 (C)

81. The object is placed at a distance of 10 cm from a concave mirror of radius of curvature 15 cm, then:

(A) It forms a magnified, real and inverted image.
(B) It forms a point image.
(C) It forms a small and inverted image.
(D) It forms image at a distance of 30 cm from mirror.

Oct 24, 2022 at 07:17 AM

Multiple Choice

ID- 16005

82. Which of the following statement are correct?

(A) A wave front is a locus of points vibrating in same phase.
(B) Wavelength is separation between two consecutive point vibrating in same phase.
(C) For two sources to be coherent their frequencies must be same.
(D) All of the above statement are correct.

Oct 24, 2022 at 07:21 AM

Multiple Choice

ID- 16006

83. The focal length of a plane mirror of height 12 cm is:

(A) infinite
(B) 12 cm
(C) 6 cm
(D) 24 cm

Oct 24, 2022 at 07:22 AM

Multiple Choice

ID- 16007

BSEB, 2019 (A)

84. The wave front due to a point source at a finite distance from the source is:

(A) Spherical
(B) Cylindrical
(C) Plane
(D) Cicular

Oct 24, 2022 at 07:24 AM

Multiple Choice

ID- 16008

BSEB, 2018 (C)

85. Which of the following statement is correct?

(A) In Lloyd's Mirror experiment central bright fringe is absent.
(B) Sustained interference can be obtained even with incoherent sources.
(C) For constructive interference between two waves at a point path difference between them should be equal to odd multiple of λ/2.
(D) All of the above statement are correct.

Oct 24, 2022 at 07:29 AM

Multiple Choice

ID- 16009

86. A ray incident at 15° on one refracting surface of a prism of angle 60° suffers a deviation 55°. What is the angle of emergence?

(A) 95°
(B) 45°
(C) 30°
(D) None of these

Oct 24, 2022 at 07:31 AM

Multiple Choice

ID- 16010

87. The geometrical path of a ray of light in a medium of refractive index 2 is 8, then the optical path (in units of length) is:

(A) 4
(B) 8
(C) 16
(D) None of these

Oct 24, 2022 at 07:33 AM

Multiple Choice

ID- 16011

88. The time taken by light to travel a distance of 3 x $10^{–2}$ m is:

(A) $10^{–8}$ s
(B) $10^8$ s
(C) $10^{–10}$ s
(D) $10^{10}$ s

Oct 24, 2022 at 07:35 AM

Multiple Choice

ID- 16012

89. The bending of a beam around corners of an obstacle is called:

(A) reflection
(B) refraction
(C) diffraction
(D) interference

Oct 24, 2022 at 07:36 AM

Multiple Choice

ID- 16013

90. A circular obstacle is placed 2m away from a point source of monochromatic light of λ = 5000 Å. The radius of the obstacle that convers that convers the first zone completely is:

(A) 2 mm
(B) 1.5 mm
(C) 1 mm
(D) 0.5 mm

Oct 24, 2022 at 07:38 AM

Multiple Choice

ID- 16014

91. Compared to blue light, the red light diffraction pattern spreads:

(A) less
(B) same
(C) more
(D) nothing can be said

Oct 24, 2022 at 07:40 AM

Multiple Choice

ID- 16015

92. Poisson's bright spot was discovered by:

(A) Fresnel
(B) Rayleigh
(C) Poisson
(D) Fraunhoffer

Oct 24, 2022 at 07:42 AM

Multiple Choice

ID- 16016

93. The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows:

(A) green shift
(B) red shift
(C) violet shift
(D) yellow shift

Oct 24, 2022 at 07:44 AM

Multiple Choice

ID- 16017

94. The application of Doppler effect are:

(A) Doppler spectrometer
(B) Doppler radius
(C) Doppler velocity
(D) All of these

Oct 25, 2022 at 06:35 AM

Multiple Choice

ID- 16018

95. Which of the following is conserved when light waves interefere?

(A) phase
(B) intensity
(C) amplitude
(D) none of these

Oct 25, 2022 at 06:41 AM

Multiple Choice

ID- 16019

96. The angle of minimum deviation of a prism depends upon the angle of:

(A) incidence
(B) reflection
(C) prism
(D) none of these

Oct 25, 2022 at 06:43 AM

Multiple Choice

ID- 16020

97. The minimum value of the refractive index is:

(A) zero
(B) 1
(C) less than 1 but not zero
(D) more than 1

Oct 25, 2022 at 06:44 AM

Multiple Choice

ID- 16021

98. Polarization of light prove the:

(A) corpuscular nature of light
(B) quantum nature of light
(C) Transerve wave nature of light
(D) Longitudinal wave nature of light

Oct 25, 2022 at 06:45 AM

Multiple Choice

ID- 16022

99. Polaroid glasses is used in sun glasses because:

(A) It reduces the light intensity to half on account of polarization
(B) It is fashionable
(C) It has good colour
(D) It is cheaper

Oct 25, 2022 at 06:47 AM

Multiple Choice

ID- 16023

100. In vacuum, the speed of light depends upon:

(A) frequency
(B) velocity
(C) wavelength
(D) None of these

Oct 25, 2022 at 06:50 AM

Multiple Choice

ID- 16024

101. C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?

(A) scattering
(B) diffraction
(C) interference
(D) polarisation

Oct 25, 2022 at 06:51 AM

Multiple Choice

ID- 16025

102. In a Young's double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1m, If the light of wavelength 6000 Å is used then the fringe width is:

(A) 0.4 Mm
(B) 0.5 Mm
(C) 0.6 Mm
(D) 0.8 Mm

Oct 25, 2022 at 06:54 AM

Multiple Choice

ID- 16026

BSEB, 2020 (A)

103. The refractive index of diamond is about:

(A) 1
(B) 1.42
(C) 2.42
(D) 4.24

Oct 25, 2022 at 06:55 AM

Multiple Choice

ID- 16027

104. Diffraction was discovered by:

(A) Grimaldi
(B) Thomas Young
(C) Malus
(D) Huygens

Oct 25, 2022 at 06:56 AM

Multiple Choice

ID- 16028

105. The electromagnetic wave theory of light fails to explain:

(A) compton effect
(B) photoelectric effect
(C) neither (A) nor (B)
(D) Both (A) and (B)

Oct 25, 2022 at 06:58 AM

Multiple Choice

ID- 16029

106. Who assomed that the light travels in a hypothetical substance called ether?

(A) Huygens
(B) Einstein
(C) Foucault
(D) Maxwell

Oct 25, 2022 at 06:59 AM

Multiple Choice

ID- 16030

107. Who first suggested that the propagation of light can be explained without reference to ether?

(A) Huygens
(B) Einstein
(C) Foucault
(D) Maxwell

Oct 25, 2022 at 07:01 AM

Multiple Choice

ID- 16031

108. Wavelength of laser beam can be used as standard to measure long distance because it:

(A) unidirectional
(B) coherent
(C) monochromatic
(D) absorbent

Oct 25, 2022 at 07:03 AM

Multiple Choice

ID- 16032

109. Laser light is considered to be coherent because it consists of:

(A) number of λ
(B) unco-ordinated wavelength
(C) co-ordinated waves of exactly same λ
(D) divergent beam

Oct 25, 2022 at 07:06 AM

Multiple Choice

ID- 16033

110. A person using a lens as a simple microscope sees an:

(A) inverted virtual image
(B) inverted real magnified image
(C) upright virtual image
(D) upright read magnified image

Oct 25, 2022 at 07:08 AM

Multiple Choice

ID- 16034

BSEB, 2017 (C)

111. Rainbow is formed due to combination of:

(A) refraction and absorption
(B) dispersion and focusing
(C) refraction and scattering
(D) dispersion and total internal reflection

Oct 25, 2022 at 07:10 AM

Multiple Choice

ID- 16035

112. When viewed in white light, soap bubble show colours because of:

(A) Interference
(B) Scattering
(C) Diffraction
(D) Dispersion

Oct 25, 2022 at 07:12 AM

Multiple Choice

ID- 16036

113. Which of the following are not be polarised?

(A) Radiowaves
(B) Ultra-violet rays
(C) Imfrared rays
(D) Ultrasonic waves

Oct 25, 2022 at 07:15 AM

Multiple Choice

ID- 16037

BSEB, 2018 (A)

114. Optical fiber communication is based on which of the following phenomena:

(A) Total internal reflection
(B) Scattering
(C) Reflation
(D) Interference

Oct 25, 2022 at 07:16 AM

Multiple Choice

ID- 16038

BSEB, 2016

115. Which of the following is used in optical fibres?

(A) reflection
(B) scattering
(C) total internal reflection
(D) interference

Oct 25, 2022 at 07:18 AM

Multiple Choice

ID- 16039

116. Wavelength of a laser beam can be used as a standard of:

(A) Time
(B) Temperature
(C) Angle
(D) Length

Oct 25, 2022 at 07:20 AM

Multiple Choice

ID- 16040

BSEB, 2016

117. When the tune length of microscope is increased, its magnifying power:

(A) increases
(B) decreases
(C) becomes zero
(D) remains unchanged

Oct 25, 2022 at 07:21 AM

Multiple Choice

ID- 16041

BSEB, 2016 (C)

118. The upper half of a convex Lense is blackned, size of image formed by it:

(A) Increases
(B) Decreases
(C) Becomes of less intensity
(D) None of these

Oct 25, 2022 at 07:23 AM

Multiple Choice

ID- 16042

BSEB, 2016 (C)

119. When concave lense of glass is immersed in water it works as:

(A) Less convergent
(B) More convergent
(C) Less divergent
(D) More divergent

Oct 25, 2022 at 07:25 AM

Multiple Choice

ID- 16043

BSEB, 2016 (C)

120. A bi-convex lens can form a virtual image if the object is placed

(A) between the lense and its focus
(B) at the focus
(C) between $f$ and 2$f$
(D) at infinity

Oct 25, 2022 at 07:29 AM

Multiple Choice

ID- 16044

BSEB, 2017 (A)

121. A short sighted person uses for clear vision

(A) Convex Lense
(B) Concave Lense
(C) Cylinderical Lense
(D) Bi-focal Lense

Oct 25, 2022 at 07:30 AM

Multiple Choice

ID- 16045

BSEB, 2017 (A), 2019 (C)

122. The angel of minimum deviation for thin prism of refractive index (μ) is:

(A) (1 – μ) $A$
(B) (μ – 1) $A$
(C) (μ + 1) $A$
(D) (μ +1) $A^2\, \ce{ms^{–2}}$

Oct 25, 2022 at 07:36 AM

Multiple Choice

ID- 16046

BSEB, 2018 (A)

123. The image formed by objective lens of a compound Microscope is:

(A) Virtual and diminished
(B) Real and diminished
(C) Real and large
(D) Virtual and Large

Oct 25, 2022 at 07:37 AM

Multiple Choice

ID- 16047

BSEB, 2018 (A)

124. A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image 5 items magnified, its focal length should be:

(A) 0.2"
(B) 0.8"
(C) 1.25"
(D) 5"

Oct 25, 2022 at 07:41 AM

Multiple Choice

ID- 16048

BSEB, 2018 (A)

125. To remove hyper metropia lens used is:

(A) Convex
(B) Concave
(C) Cylindrical
(D) Plano-convex

Oct 25, 2022 at 07:42 AM

Multiple Choice

ID- 16049

BSEB, 2018 (A)

126. The resolving power of human eye (in minute) is:

(A) $\frac{1}{60}$
(B) 1
(C) 10
(D) $\frac{1}{2}$

Oct 25, 2022 at 07:44 AM

Multiple Choice

ID- 16050

BSEB, 2017 (C)

127. Blue colour of sky is due to:

(A) scattering
(B) interference
(C) polarisation
(D) diffraction

Oct 25, 2022 at 07:45 AM

Multiple Choice

ID- 16051

BSEB, 2017 (C)

128. If energy of of photon of blue light is $E_1$, and that of yellow light is $E_2$ then:

(A) $E_1 = E_2$
(B) $E_2 > E_2$
(C) $E_1 < E_2$
(D) $E_1 = 2E_2$

Oct 25, 2022 at 07:49 AM

Multiple Choice

ID- 16052

BSEB, 2018 (A)

129. Which of the following phenomena taken place when a monochromatic light is incident on a prism?

(A) Dispersion
(B) Deviation
(C) Interference
(D) All of the above

Oct 25, 2022 at 07:52 AM

Multiple Choice

ID- 16053

BSEB, 2018 (A)

130. A convex lens is dipped in a liquid, whose refractive index is equal to refractive index of material of lens. Then its focal length will:

(A) become zero
(B) become infinite
(C) decrease
(D) increase

Oct 25, 2022 at 07:54 AM

Optics

Board » Bihar Board » Class 12th » English Medium » Science » Physics » L-6: Optics

Objective Questions (MCQs)

1. Brewster's law is:

2. The magnifying power of a compound microscope for normal adjustment is:

3. Path difference in destructive interference is equal to:

4. When light enters from one medium into another medium, which quantity does not change?

5. When we see an object, then the image formed on retina is:

6. On reasing the length of the tube of compound microscope, magnifying power:

7. The velocity of light is maximum in:

8. Which of the relations is correct for the magnifying power of compound microscope?

9. Optical path is equal to:

10. The lens which is used to remove short sightedness is:

11. The radius of curvature of plane mirror is:

12. SI unit of power of a lens is:

13. The magnifying power of magnifying glass of power 12 diopter is:

14. A biconvex lens (μ = 1.5) has equal curvature each of 20 cm. The power of the lense is:

15. When two converging lenses of same focal length $f$ are placed in contact, then the focal length of the combination is:

16. When a ray of light enters a glass slab, it's wavelength:

17. The transerve nature of light wave supports:

18. The colour of thin film is due to:

19. Power of parallel sided glass-slab is:

20. Which of the following is correct for refractive index of mean colour (yellow colour)?

21. Which of the following is correct for Astronomical telescope?

22. Angular dispersion is equal to:

23. Width of interference fringe β:

24. A unit of which physical quantity is light year?

25. Mirage is a phenomenon due to:

26. A ray of light incident at an angle $i$ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is:

27. A small telescope has an objective lens of focal length 144 cm and an eye piece of focal length 6.0 cm. What is the separation between the objective and the eye piece?

28. Which of the following eye defects is removed by convex lens?

29. Which of the following relations is correct for dispersive power?

30. The distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. What should be the focal length of the spectacles?

31. Which of the following colours of white light deviated most when passes through a prism?

32. The power of convex lens of focal length 20 cm in dioptre is:

33. The nearer point of hypermetropic eye is 40 cm. The lens to be used for its correction should have the power:

34. The power of a biconvex lens is 10 dioptre and the radius of curvature of each surface is 10 cm. Then the refractive index of the material of the lens is:

35. What can be the largest distance of an image of a real object from a convex mirror of radius of curvature is 20 cm?

36. A small angle prism (μ = 1.62) gives a deviation of 4.8°. The angle of prism is:

37. A ray of light gets incident on a transparent material's slab at an angle of incidence 60°. If the reflected and the refracted rays are perpendicular to each other, than which of the given option (s) is (are) correct:

38. A thin glass (refractive index 1.5) lens has optical power of –8 D in air. Its optical power in a liquid medium with refractive index 1.6 will be:

39. Two mirrors at an angle θ° produce 5 images of a point. The number of images produced when θ is decreased to θ°–30° is:

40. Critical angle of glass is $θ_1$ and that of water is $θ_2$. The critical angle for water and glass surface would be $(μ_v = 3/2, μ_w = 4/3)$.

41. For a glass prism (μ = $\sqrt{3}$) the angle of minimum deviation is equal to the angle of the prism. The angle of the prism is:

42. Light travels in two media $A$ and $B$ with speeds 1.8 x $10^6$ $\ce{ms^{–1}}$ and 2.4 x $10^8$ $\ce{ms^{–1}}$ respectively. Then the critical angle between them is:

43. Difference objects at difference distances are seen by the eye. The parameter that remains constant is:

44. Critical angke of light going from medium (i) time (ii) is θ. The speed of light in median (i) is $v$, then the speed of light in medium (ii) is:

45. A real image of a distant object is formed by a planoconvex lens on its principal axis. Spherical aberration is:

46. A converging lens is used to form an image on a screen. When the upper half of the lens is covered by an opaque screen:

47. Which if the following forms a virtual and erect image for all positions of the object?

48. For a total internal reflection, which of the following is corect?

49. Two lenses of focal lengths 20 cm and –40 cm are held in contact. The image of an object at infinity will be formed by the combination at:

50. The final image in an astronomical telescope with respect to object is:

51. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will:

52. A short pulse of white light is incident from air to glass slab at normally incidence. After travelling through the slab the first colour to emerge is:

53. Which of the following cannot be polarised?

54. If a mirror is approaching you at a speed of 10 $\ce{ms^{–1}}$, the speed with which your image approach you is:

55. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to water is:

56. The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:

57. A concave mirror of focal length $f$ produced an image $n$ times the size of the object. If the image is real then the distance of the object is:

58. Which one of the following has maximum refractive index?

59. A convex lens $(n = 1.5)$ is immersed in water $(n = 1.33)$, then it will behave as a:

60. Equivalent focal length of two lenses in contact having power –15 D and +5 D will be:

61. A convergent lens will become less convergent in:

62. When light travels from one medium to another, which if the following does not change?

63. Two lens power –15 D and +15 D are placed in contact coaxially. The focal length of equivalent lens is:

64. The air bubble inside water shine due to:

65. When a ray of light (white) enters a lens, undergoes a change is:

66. Radio waves from an antenna travel with the velocity of:

67. The magnifying power of an astronomical telescope for normal adjustment is:

68. Cylindrical lenses are used to correct the eye defect called:

69. The image formed by simple microscope is:

70. Focal length of eye-lens of a healthy man is about:

71. Velocity of light in vaccum is $c$. Its value in glass (μ = 3/2) will be:

72. Which of the following is not essential for the formation of pure spectrum?

73. Which produces additional luminiscene in a fluorescent tube:

74. Far point of a myopic eye is 40 cm. The dioptic power of a corrective lens is:

75. The length of an astronomical telescope for normal adjustment is:

76. Light owes its colour to its:

77. The angle of deviation for a prism is greatest for: