The critical angle for a substance in air is measured at $53.7 ^ { \circ }$. If light enters this substance from air at $45.0 ^ { \circ }$ with the normal, at what angle with the normal will it continue to travel?
A) $34.7 ^ { \circ }$
B) $53.7 ^ { \circ }$
C) $45.0 ^ { \circ }$
D) It will not continue, but will be totally reflected.

Question

Quizplus · Accepted Answer

Since the angle of incidence $45.0 ^ { \circ }$ is less than the critical angle $53.7 ^ { \circ }$, the light will refract into the substance. Using Snell's law, the angle of refraction can be calculated, resulting in an angle of $34.7 ^ { \circ }$.

The Critical Angle for a Substance in Air Is Measured 53.7∘53.7 ^ { \circ }53.7∘

The Critical Angle for a Substance in Air Is Measured $53.7 ^ { \circ }$