  :Like the Fresnel equations, Brewster's angle is a concept that derives entirely from the wave nature of polarized light.  If you read Jed Z. Buchwald's book, The Rise of the Wave Theory of Light, it's all about polarization effects.  Geometrical optics was solid before Thomas Young and August Fresnel and other troublemakers pointed out that Isaac Newton had gotten it wrong, and it took years of experiments and theory to triumph over pure ray geometrical optics, with contributions from Brewster and others.  Of course, this all came before Maxwell and his equations, but Maxwell provided a simpler way to understand it.  So this wild recategorization is a bit off the mark.  