A light ray passes from air through a thin plastic slab (n = 1.34)with parallel sides.If the ray in air makes an angle of 33° 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) 24°
B) 33°
C) 18°
D) 25°
E) 44°

Question

A light ray passes from air through a thin plastic slab (n = 1.34)with parallel sides.If the ray in air makes an angle of 33° 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) 24°
B) 33°
C) 18°
D) 25°
E) ​44°

Quizplus · Accepted Answer

The angle of incidence equals the angle of refraction when the light exits a medium with parallel sides, so the angle of incidence is 33°.

A Light Ray Passes from Air Through a Thin Plastic