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.
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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