A container of flint glass (n = 1.66) holds a small quantity of benzene (n = 1.501). What is the critical angle for internal reflection of a ray in the liquid when it is incident on the liquid-to-glass surface?
A) 89.5°
B) 64.7°
C) 41.1°
D) The critical angle does not occur in this case.

Question

Quizplus · Accepted Answer

The critical angle occurs when light travels from a medium with a higher refractive index to one with a lower refractive index. Here, light is moving from benzene (n = 1.501) to flint glass (n = 1.66), which is the opposite scenario, so no critical angle exists.

A Container of Flint Glass (N = 1