The speed of light in a material is 0.50c. What is the critical angle of a light ray at the interface between the material and a vacuum?
A) 30°
B) 21°
C) 24°
D) 27°

Question

Quizplus · Accepted Answer

The critical angle can be calculated using the formula: sin(critical angle) = n2/n1, where n1 is the refractive index of the material and n2 is the refractive index of the vacuum (which is 1). The refractive index n1 is the speed of light in vacuum divided by the speed of light in the material, which is 1/0.50 = 2. Therefore, sin(critical angle) = 1/2, which corresponds to a critical angle of 30°.

The Speed of Light in a Material Is 0