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## Homework Statement

I am studying the Law of Refraction. I am at a point in my textbook called a "checkpoint". These are supposed to be simple questions to test understanding. I'm apparently not understanding thus far because I cannot figure out this problem.

http://img262.imageshack.us/img262/7029/refractionqn3.jpg [Broken]

## Homework Equations

Snell's Law?

## The Attempt at a Solution

I'm sure the angles of line segments b and c (relative to a?) will be the determining factor. Since the problem says "original materials a" does that mean we measure all angles relative to line segment a? How do I proceed more mathematically on this problem - perhaps using Snell's law?

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