Question

A ray of light passes from vacuum into a medium of refractive index n. If the angle of incidence is twice the angle of refraction , then the angle of incidence is :

(A) cos^–1 (n/2) 

(B) sin^–1 (n/2) 

(C) 2 cos^–1 (n/2) 

(D) 2sin^–1(n/2)

Answer 1

Correct Answer is: (C) 2 cos^–1 (n/2) 

Let angle of refraction is θ