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phys documents (dragged) 33 - Chapter 6: Optics 27 with I =...

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Chapter 6: Optics 27 with I = ± | ± S | ² it follows: R + T =1 . A special case is r ± =0 . This happens if the angle between the reFected and transmitted rays is 90 . ±rom Snell’s law it then follows: tan( θ i )= n . This angle is called Brewster’s angle . The situation with r is not possible. 6.6 Polarization The polarization is de²ned as: P = I p I p + I u = I max - I min I max + I min where the intensity of the polarized light is given by I p and the intensity of the unpolarized light is given by I u . I max and I min are the maximum and minimum intensities when the light passes a polarizer. If polarized light passes through a polarizer Malus law applies: I ( θ I (0) cos 2 ( θ ) where θ is the angle of the polarizer. The state of a light ray can be described by the Stokes-parameters : start with 4 ²lters which each transmits half the intensity. The ²rst is independent of the polarization, the second and third are linear polarizers with the transmission axes horizontal and at +45
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