Science Equation             Name Critical Angle       Equation sin ⁢ θ c = n 2 n 1       Definition of terms θ = critical angle, n1 and n2 = refractive indices of the media       Comments   Snell's Law n1 sin θ1 = n2 sin θ2 governs the refraction of a light ray at the interface of two media. If sin θ2 = 1, then the light ray is not refracted out of the second medium, but is totally internally reflected. The angle at which this occurs is called the critical angle.   At angles above the critical angle Snell's Law no longer holds as the phenomenon of refraction no longer occurs.       References Optics, E Hecht, A Zajac, Addison-Wesley, 1974         [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Contact | About

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