Question

A ray of light enters the face BA of a right
angled prism of refracting material and right
angle at A at grazing incidence. It emerges
from adjacent face AC at an angle o to the
normal. If cis critical angle of prism, the
relation between 0 and cis​

Answer 1

Answer:

Since ∠AQP=45o (total internal angle of a triangle is 180o), the angle of incidence will be 45o. Since, critical angle for glass prism is 42o the ray undergoes total internal reflection with an angle of reflection of 45o. It then strikes BC normally and hence angle of incidence at that face is 0o.