Lucite Has an Index of Refraction Of $1.50$ What Is Its Critical Angle If It Is in Is

Multiple Choice

Lucite has an index of refraction of $1.50$ . What is its critical angle if it is in air?

A) $65.2 ^ { \circ }$
B) $15 ^ { \circ }$
C) $41.8 ^ { \circ }$
D) $1.16 ^ { \circ }$
E) $87.4 ^ { \circ }$