Question

A ray of light moves from air to an unknown transparent medium. If the angle of incidence is 45 degree and angle of refraction is 30 degree find the refractive index of the unknown substance-
(1)1.144
(2)1.241
(3)2.414
(4)1.414​

Answer 1

Explanation:

Solution

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Correct option is

B

1.42

Given,

Angle of incidence ∠i=45

0

Angle of refraction ∠r=30

0

By Snell's law

n=

sinr

sini

, where n is the refractive index of the medium.

n=

sin30

0

sin45

0

=

2

=1.42

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Answer 2

Option 1 is correct

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