A Thin Beam of Light Enters a Thick Plastic Sheet $32.0 ^ { \circ }$

Multiple Choice

A thin beam of light enters a thick plastic sheet from air at an angle of $32.0 ^ { \circ }$ with the normal and continues in the sheet at an angle of $23.0 ^ { \circ }$ with the normal. What is the index of refraction of the plastic?

A) 1.11
B) 0.74
C) 1.28
D) 1.36