1. The problem statement, all variables and given/known data Light is incident from glass (n=1.5) to water (n=1.33). Find out the range of angle of deviation for which there are two angles of incidence. 2. Relevant equations Snell's Law 3. The attempt at a solution The lowest value of angle of deviation would be 0° when i = 0. But, I am unable to find the highest value. Would it be during refraction or TIR?