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Removed category physics
Refraction is the change in direction of light when moving from one medium to another.
'''Refraction''' is the change in direction of [[light]] when moving from one medium to another. This phenomenon is exploited to make lenses, from those used in [[eyeglasses]], microscopes and refracting [[telescopes]].
The degree to which a medium refracts light is expressed as that medium's [[index of refraction]]. For most materials, the index of refraction changes gradually with the wavelength (color) of the light. Because of this wavelength dependence, a glass prism will separate the components of white light according to their wavelengths, creating the colors of the [[rainbow]]. Rainbows are the result of the wavelength-dependence of water's refractive index.
The amount that the direction changes when moving between the two media is determined by [[Snell's Law]].
==See also==
*[[reflection]]
[[Category:Optics]]