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'''Refraction''' is the change in direction of [[light]] when moving from one medium to another.  Refraction produces [[rainbow]]s and a similar effect in a [[prism]]. It is also the principle used in [[eyeglasses]] and the refracting [[telescope]].
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'''Refraction''' is the change in direction of [[light]] when moving from one medium to another.  Refraction produces [[rainbow]]s and a similar effect in a [[prism]]. It is also the principle used in [[eyeglasses]] and the refracting [[telescope]].  The degree to which a medium refracts light is expressed as that medium's [[index of refraction]].
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The amount that the direction changes when moving between the two media is determined by [[Snell's Law]].
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The amount that the direction changes when moving between the two media is determined by [[Snell's Law]].
 
[[category:physics]]
 
[[category:physics]]
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