Brewster's angle, also known as the polarization angle, is the angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection. At this angle, the reflected light is completely polarized perpendicular to the plane of incidence. Mathematically, Brewster's angle (θ_B) can be determined using the refractive indices of the two media involved.
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For an interface between two lossless, isotropic, nonmagnetic media with unequal refractive index values , Brewster's angle is the incidence angle at which the reflected amplitude in transverse magnetic polarization vanishes. The Fresnel equations and Snell's law give ; the reflected and transmitted rays are perpendicular there. The usual formula assumes equal magnetic permeabilities.
