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Question

A ray of light travelling in air is incident on the plane of a transparent medium with an angle of incidence 45 and the angle of refraction 30. Find the refractive index of the medium.

A
2
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B
12
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C
1
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D
2
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Solution

The correct option is D 2
Given:
Angle of incidence, i=45
Angle of refraction, r=30

From snell's law, refractive index is given by:
n=sin isin r
n=sin 45sin 30
n=(12)(12)
n=2

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