Chapter 6: Optics27withI=|S|it follows:R+T= 1. A special case isr= 0. This happens if the angle between the reflectedand transmitted rays is90◦. From Snell’s law it then follows:tan(θi) =n. This angle is calledBrewster’sangle. The situation withr⊥= 0is not possible.6.6PolarizationThe polarization is defined as:P=IpIp+Iu=Imax-IminImax+Iminwhere the intensity of the polarized light is given byIpand the intensity of the unpolarized light is given byIu.ImaxandIminare the maximum and minimum intensities when the light passes a polarizer. If polarizedlight passes through a polarizerMalus lawapplies:I(θ) =I(0) cos2(θ)whereθis the angle of the polarizer.The state of a light ray can be described by theStokes-parameters: start with 4 filters which each transmits halfthe intensity. The first is independent of the polarization, the second and third are linear polarizers with thetransmission axes horizontal and at+45◦
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Polarizer, Imin, linear polarizer, horizontal linear polarizer, polarizer Malus law