A beam of light in air is incident at an angle of 24.0° to the surface of a rectangular block of clear plastic (n = 1.46).The light beam first passes through the block and re-emerges from the opposite side into air at what angle to the normal to that surface?
A)36°
B)16°
C)24.0°
D)29°
E)0.64°

Question

Quizplus · Accepted Answer

The angle of incidence in air equals the angle of emergence when light re-enters air from the plastic due to the principle of reversibility of light.

A Beam of Light in Air Is Incident at an Angle