Light MCQ question and answer with solution

71

In the mirror formula, what does 'v' indicates?

A) Image distance B) Object distance C) Vertical distance D) Height of image

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Answer & Solution

Answer: Option A

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72

If the power of a corrective lens is + 2.0D, then it is a-

A) convex lens B) concave lens C) convex mirror D) concave mirror

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Answer & Solution

Answer: Option A

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73

The gas used in discharge tubes for optical decoration and advertising is

A) Carbon dioxide B) Ammonia C) Sulphur dioxide D) Neon

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Answer & Solution

Answer: Option D

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74

Which of the seven colors of white light is least disturbed after the reflection of light by a prism of glass?

A) blue B) violet C) red D) orange

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Answer & Solution

Answer: Option C

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75

Spectacles used for viewing 3D films have

A) bifocal lens B) convex lens C) concave lens D) polaroids

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Answer & Solution

Answer: Option D

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76

Convex mirrors are used in-

A) shaving mirror B) dentist mirror C) vehicle headlight D) rear-view mirror

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Answer & Solution

Answer: Option D

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77

Why do stars twinkle in the sky at night?

A) Due to advance light B) Due to atmospheric refraction of starlight C) Due to dispersion of light D) Due to hot air

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Answer & Solution

Answer: Option B

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78

Convex mirrors are used as a rear view mirror in motor cycles because

A) it forms real image B) it forms erect (upright) image C) it forms smaller image as compared with object D) All of the above

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Answer & Solution

Answer: Option C

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79

Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them.
Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option A

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80

A colour blind person cannot

A) see distant objects B) see black colour C) distinguish between certain colours D) have persistence of vision

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Answer & Solution

Answer: Option C

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Light MCQ question and answer with solution | Physics Gk MCQs