Question

A ray of light passes through a prism having refractive index (n = √2), Suffers minimum deviation If angle of incident is double the angle of refraction within prism then angle of prism is _________ . 

(A) 30° (B) 60° (C) 90° (D) 180°

Answer 1

The correct option is (C) 90°.

Explanation:

Given : prism is in position of minimum deviation hence r = (A/2) where A is angle of prism hence 

A = 2r = 2 × 45° = 90°.