A ray of light incident on one face of an equilateral prism at 60^ enters and leaves the prism symmetrically. Refractive index of the prism material is

Step-by-step solution

Given, angle of prism, A=60^ As, the ray of emergence is symmetrical to incident ray. So, the angle of minimum deviation, D_ m =60^ . Refractive index of prism, = ( A+D_ m 2 ) ( A 2 ) = ( 60^ +60^ 2 ) ( 60^ 2 ) = 60^ 30^ = 3 2 2 1 = 3 =1.73