Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: One thing is true of both regular and diffuse reflection. The angle at which the reflected rays leave the surface is equal to the angle at which the incident rays strike the surface. This is known as the law of reflection . The law is illustrated in the Figure below and also in this animation: http://www. physicsclassroom. com/mmedia/optics/lr. cfm. Answer: reflection
Output:
Which law describes the angle at which the reflected rays leave the surface is equal to the angle at which the incident rays strike the surface?