In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

One coefficient of this phenomenon can be found with Schlick's approximation, and its diffuse form is applied in Lambert's cosine law. This phenomenon notably does not occur for a certain polarization at Brewster's angle. At values above the critical angle, the (*) total internal type of this phenomenon occurs, and the law of it states that the angle at which this process occurs is equal to the angle of incidence. For ten points, identify this phenomenon in which a wave returns to its original medium after contacting a surface, easily observed with mirrors.
Science