INTRO

     Refraction is the change in direction of a wave (i.e light) due to a change in its speed. This is most commonly observed when a wave passes from one medium to another at any angle other than 90° or 0°. This is why a pencil placed in a glass of water appears to be at a different angle below the water level.

                                           A beam of light is refracted as it passes through a prism.


     Refraction is just one of the many basic principles of physics that have to do with the way a camera lens captures an image.