## Snell's law

Snell's lawnoun

A law describing the refraction of a ray of light at the surface between two media, such that the product of the refractive index of the first medium and the sine of the angle of incidence equals the product of the refractive index of the second medium and the sine of the angle of refraction.

Origin of Snell's law

After Willebrord*Snel*,

*van Royen (1580–1626), also called Willebrord Snellius, Dutch astronomer and mathematician who formulated the law*.

## snell-s-law

Noun

(*uncountable*)

Origin

For Willebrord van Roijen Snell Dutch mathematician