1. The problem statement, all variables and given/known data At the boundary between water (n=1.33) and flint glass (n=1.66), incoming light at ~49 degrees from the normal is refracted. Of course, I can use Snell's law to calculate the angle of refraction. However, my question is whether any of the light at this boundary is also Reflected?? I think it would be because light reflects off both rough (diffuse reflection) and smooth surfaces, but can anybody confirm? Thanks! 2. Relevant equations N/A 3. The attempt at a solution See above.