1. The problem statement, all variables and given/known data A layer of ice having parallel sides floats on water. If light is incident on the upper surface of the ice at an angle of incidence of 15.0°, what is the angle of refraction in the water? 2. Relevant equations 3. The attempt at a solution i know its not so simple that i can just use Sin theta n1 = sin theta n2.... but i dont know how the fact that it is parallel will change the equation. Should i find the angle of refraction in the ice and then use that as the angle of incidence for the water???