Refraction

In physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed or by a change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

Extends: Refraction, [Physical phenomena](https://wikipedia.org.ai/Physical phenomena), [Geometrical optics](https://wikipedia.org.ai/Geometrical optics), [Physical optics](https://wikipedia.org.ai/Physical optics)