Task: Text Categorization
Input (English): 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.
Output (English): Science