When an unpolarized planar electromagnetic wavefront impinges on a flat dielectric surface, there is a unique @[email protected] (\(\theta_{\text{B}}\)), commonly referred to as Brewster @[email protected], at which the reflected waves are all polarized into a single plane.
  1. Expression for Brewster @[email protected]: \[\theta_{\text{B}} = arctan \frac{n_{2}}{n_{1}} = arctan \left (\frac{\varepsilon_{2}}{\varepsilon_{1}} \right)^{1/2}\] where \(n_{2}\) and \(n_{1}\) are the refractive indices of the receiving surface and the initial medium, respectively, and \(\varepsilon_{2}\) and \(\varepsilon_{1}\) are the relative static permittivities (formerly called dielectric constants).
  2. For a randomly polarized beam incident at Brewster @[email protected], the electric fields of the reflected and refracted waves are perpendicular to each other
  3. For a wave incident from air on water (\(n = 1.333\)), glass (\(n = 1.515\)), and @[email protected] (\(n = 2.417\)), the Brewster angles are \(53\), \(57\), and \(67.5\ \text{degrees}\), respectively.
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 310 [Terms] [Paper]