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) $87.4 ^ { \circ }$

Question

Quizplus · Accepted Answer

The critical angle can be calculated using the formula $\theta_c = \sin^{-1}(\frac{n_2}{n_1})$, where $n_2$ is the index of refraction of air (1.00) and $n_1$ is the index of refraction of Lucite (1.50). This gives $\theta_c = \sin^{-1}(\frac{1.00}{1.50}) = 41.8^\circ$.

Lucite Has an Index of Refraction Of 1.501.501.50 What Is Its Critical Angle If It Is in Is

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