The Angle of Refraction Refraction is the bending of the path of a light wave as it passes across the boundary separating two media.
Refraction is caused by the change in speed experienced by a wave when it changes medium.
Perhaps there are numerous answers to such a question. The concern of this lesson is to express the amount of refraction of a light ray in terms of a measurable quantity that has a mathematical value. The diagram to the right shows a light ray undergoing refraction as it passes from air into water. The angles which the incident ray makes with the normal line is referred to as the angle of incidence . Similarly, the angle which the refracted ray makes with the normal line is referred to as the angle of refraction .