Snell's law

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Refraction o licht at the interface atween twa media o different refractive indices, wi n2 > n1. Syne the velocity is lawer in the seicont medium (v2 < v1), the angle o refraction θ2 is less nor the angle o incidence θ1; that is, the ray in the heicher-index medium is closer tae the normal.

Snell's law (an aa kent as the Snell–Descartes law an the law o refraction) is a formula uised tae describe the relationship atween the angles o incidence an refraction, when referrin tae licht or ither waves passin throu a boondary atween twa different isotropic media, such as watter, gless, or air.