A light ray passes from air through a thin plastic slab (n = 1.3)with parallel sides.If the ray in air makes an angle of 67° with the normal after leaving the slab,what is the angle of incidence for the ray in air as it impinges upon the other side of the slab?
A) 33°
B) 67°
C) 58.5°
D) 45°

Question

Quizplus · Accepted Answer

The angle of incidence is equal to the angle of refraction when the light exits the slab, due to the parallel sides of the slab. Thus, the angle of incidence is 67°.

A Light Ray Passes from Air Through a Thin Plastic