# Snells Law Formula

## Snells Law Formula

Snell’s Law Formula explains the relationship between angle of refraction, incidence, and refractive law of indices for specified media such as light, glass, and air. According to this theory, ratio of sines of the angles of incidence 1 and refraction 2 for a given set of media is equal to phase velocity ratio (v1/v2) in the two media, or equivalently, the refractive index ratio (n2/n1). In a medium, light bends or refracts. Snell’s law determines the angle of bending.

### Snell’s Law

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