What is the critical angle of a light ray at the interface between the material and a vacuum?

Question

The speed of light in a material is 0.52c. What is the critical angle of a light ray at the interface between the material and a vacuum?

a. 31 degrees

b. 29 degrees

c. 0.55 degrees

d. 16 degrees

Answer 1

Hi Oscar A., you again!

First, figure the index of refraction of the medium: n = speed of light in vacuum/speed of light in medium

Then figure critical angle, from Snell's Law, for critical angle, emergent ray = 90 .degrees. from normal.

Please, don't post your entire problem set on Wyzant. Not what it's for.

-- Cheers, --Mr. d.