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'''Snell's Law''' describes how the direction of [[light]] changes when it moves from one medium to another. The two forms of the law are: <br />
'''Snell's Law''' describes how the direction of [[light]] changes when it moves from one medium to another. The two forms of the law are:
<math> n_1 sin(\theta _1) = n_2 sin(\theta _2) </math> <br />
:n<sub>1</sub> sin(θ<sub>1</sub>) = n<sub>2</sub> sin(θ<sub>2</sub>)
<math> v_2 sin(\theta _1) = v_1 sin(\theta _2) </math> <br />
:v<sub>2</sub> sin(θ<sub>1</sub>) = v<sub>1</sub> sin(θ<sub>2</sub>)
where n1 and n2 are the indices of [[refraction]] in medias 1 and 2, respectively, and <math> \theta _1 </math> and <math> \theta _2 </math> is the angle from the normal of the [[plane]] dividing the 2 media and the ray.
where:
:n<sub>1</sub> and n<sub>2</sub> are the indices of [[refraction]] in medias 1 and 2, respectively
:v<sub>1</sub> and v<sub>2</sub> are the velocities of light in medias 1 and 2, and
:θ<sub>1</sub> and θ<sub>2</sub> are the angle from the normal of the [[plane]] dividing the 2 media and the ray.
The index of refraction of a material is inversely proportional to the speed of light in that material, i.e. light will move slower in a material with a high index of refraction than it will in a material with a low index of refraction.
The index of refraction of a material is inversely proportional to the speed of light in that material, i.e. light will move slower in a material with a high index of refraction than it will in a material with a low index of refraction.