A large cube of glass has a metal reflector on one face and water on an adjoining face (the figure). A light beam strikes the reflector, as shown. You observe that as you gradually increase the angle of the light beam, if Theta is greater than 58.7 no light enters the water.
What is the speed of light in this glass?
n=1.52 for glass
The Attempt at a Solution
I'm not really sure which way to approach this problem. I initially thought of using n=c/v
This answer is wrong, and I can't see what I'm doing wrong. Any advice would be appreciated.