Refraction
This is an old revision of this page, as edited by Ed Poor (talk | contribs) at 21:34, April 8, 2009. It may differ significantly from current revision.
Refraction is the change in direction of light when moving from one medium to another. Refraction produces rainbows and a similar effect in a prism. It is also the principle used in eyeglasses and the refracting telescope.
The amount that the direction changes when moving between the two media is determined by Snell's Law.