Question

A ray of light passing from air to glass is incident at angle of 30°. Calculate the angle of refraction in the glass if the refractive index of glass is 1.50.

Answer 1

Refractive index of glass_a∩_g=  sin i
                                                      sin r
∴ sin r = sin i = sin 30°=  0.5      = 0.3
               ng      1.50       1.50
                  r = 19.5°

Answer 2

19.47