Question

A ray of light from rarer medium strikes a denser medium such that reflected and refracted rays make an angle of 90° with each other. The angle of reflection and angle of refraction are 60° and 30° respectively, then refractive index of the medium is

(a) 1.5

(b) 1.73

(c) 1.41

(d) 1.75

Answer 1

Answer is : (b) 1.73

According to given question, r = 60° = i

Given, condition satisfies Brewster’s law,

= 1.73