# Homework Help: Waves Unit- Angle of Incidence

1. Mar 8, 2012

### epik high

1. The problem statement, all variables and given/known data
http://imgur.com/LDx7I

2. Relevant equations
http://en.wikipedia.org/wiki/Snell's_law

3. The attempt at a solution
I'm not really sure on the approach to take for this question. Since it proves 2 angles, Snell's Law could prove to be beneficial.

Thanks for the help!

Last edited: Mar 8, 2012
2. Mar 8, 2012

### issacnewton

First , use the snell's law on the bottom surface to connect the critical angle to the refractive index of the block. For the vertical surface, the angle of transmission is $90-\theta_c$ using basic geometry. then use snell's law again at the vertical surface. at the vertical surface angle of incidence is $\theta_1$