Correct Answer: Option C

Explanation

From the above diagram ; ? = 90^o - 30^o = 60^o
v = 90 - 60 = 30
∴ refractive index = (sin ?)/(sin v) = (sin 60^o / sin 30^o) = ^√3/2/_1/2
= √3/2 x 1/2
= √3

There is an explanation video available below.

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