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

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.

Correct Answer:

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