# Snells Law

Describes the path light rays take when they pass through an interface between two media of different densities. It is a formal description of the way light bends when it passes through an interface between two materials with different densities. The law is derived from Snell's equation:

Θ_{r} = arcsin **[** (sin (Θ_{i}) × n_{i} ÷ n_{r}**]**

Where:

Θ_{r} = the angle of refraction^{*}

Θ_{i} = the angle of incidence

n_{i} = the refraction index of medium containing the incident ray^{*}

n_{r} = the refraction index of medium containing the transmitted ray

The equation can be used to determine the path a light ray will take at a surface given knowledge of the densities of the two media and the angle if incidence.

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