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Boundaries and Waves Tour

Brewster's Angle

Brewster angle is the angle of incidence where there is no reflected power. A Brewster's angle only exists for TM waves. This is due to the dipoles that create the reflected wave. When a TM wave hits an interface dipoles are induced in the material in the direction of the E field. At just the right angle the dipole axes line up with the direction of the reflected wave. Since a dipole does not radiate along it's axis there is no reflected wave generated. This happens when the 'reflected' wave and the transmitted wave are perpendicular to each other.