Question

Fig. shows a path of ray AB through an isosceles right angled prism. What is the magnitude of the angle of incidence on (i) face PR (ii) PQ?

Answer 1

(i) On face PR: The ray AB is perpendicular to face PR.

Therefore,

\[ {i=0^\circ} \]

(ii) On face PQ: In an isosceles right-angled prism, face PQ is inclined at \(45^\circ\) to the horizontal. Hence the angle between the ray and the normal to PQ is

\[{i=45^\circ} \]