Refraction through Prism – A Question
A light ray falls perpendicular to one of the faces of a glass prism of angle 60 and refractive index 1.5,
a) the angle of emergence.
b) the angle of deviation.
The ray will enter without any deviation. Therefore, the angle of incidence at the second face inside the prism = 60 degree
(From A +90+ (90-r2)=180)
Since the critical angle for glass is less than this, the ray of light will undergo total internal reflection. So it reflects towards the base internally.