Light MCQ question and answer with solution

91

In total internal reflection, the light travels from

A) rarer to denser medium and it occurs with no loss of intensity B) denser to rarer medium and it occurs with no loss of intensity C) rarer to denser medium and it occurs with loss of intensity D) denser to rarer medium and it occurs with loss of intensity

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Answer & Solution

Answer: Option D

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92

Fibre optics work on the principle of

A) scattering of light B) total internal absorption C) total internal reflection D) optical rotation

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Answer & Solution

Answer: Option C

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93

. . . . . . . . lenses are used by people suffering from myopia-

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

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Answer & Solution

Answer: Option C

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94

One can distinguish a telescope from a microscope by observing

A) length B) colour C) size of the lens D) length and size of the lens

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Answer & Solution

Answer: Option D

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95

Which one of the following statement is correct?

A) The image formed by a concave mirror for an object lying at infinity is at the principal focus, highly diminished, real and inverted B) A ray of light parallel to the principal axis after reflection from a concave mirror appears to diverge from the principal focus of the mirror C) The focal length of a spherical mirror is double of its radius of curvature D) A ray of light travelling from a rarer medium to a denser medium bends away from the normal

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Answer & Solution

Answer: Option A

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96

Red' is used as a danger signal because

A) blood is red B) red light is scattered least by the air molecule C) red colour is easily available D) red colour is soothing for eye

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Answer & Solution

Answer: Option B

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97

When beams of red, blue and green lights fall on the same spot, the colour of the light becomes

A) Violet B) Red C) Yellow D) White

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Answer & Solution

Answer: Option D

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98

The concept of expanding universe is based on

A) Doppler effect B) Stark effect C) Zeeman effect D) Raman effect

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Answer & Solution

Answer: Option A

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99

When a convex lens produces a real image of an object, the minimum distance between the object and image is equal to

A) the focal length of the convex lens B) one-half of the focal length of the convex lens C) twice the focal length of the convex lens D) None of the above

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Answer & Solution

Answer: Option C

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100

. . . . . . . . lenses are used by people suffering from hypermetropia.

A) concave B) cylindrical C) convex D) planar

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Answer & Solution

Answer: Option C

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Light MCQ question and answer with solution | Physics Gk MCQs