What does the angle of reflection measure?

The angle of reflection specifically refers to the angle formed between the reflected ray and the normal line at the point of incidence on a surface. In the context of reflection, the normal is an imaginary line that is perpendicular to the surface where the reflection occurs. The law of reflection states that the angle of incidence (the angle between the incoming ray and the normal) is equal to the angle of reflection. Therefore, by focusing on the angle of reflection, which is defined in relation to the normal, this choice accurately captures what this angle measures.

The other options involve angles or measurements that do not pertain specifically to the reflection process. For instance, the angle between the incoming ray and the normal refers to the angle of incidence, while the angle of wave incidence also relates to the same concept. The overall height of the wave, on the other hand, is a parameter describing wave properties unrelated to the angles involved in reflection. Thus, option B correctly identifies the angle of reflection.