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Unformatted text preview: 12, 2013 Polarization, cont.
E2 = E1 cos θ
afterwards. Angle between initial
polarization of E, and the
direction of polarizer slits. Amplitude
before 2 I2 = I1 cos θ
Initially unpolarized light: I2 = I1
2 Perpendicular polarizers: Iout = 0
Perpendicular polarizers, with another
non-perpendicular one in between:
Tuesday, November 12, 2013 Iout = 0 Brewster’s law
Reﬂected waves want to have their E parallel to the
reﬂecting surface. Like skipping stones on water.
Drawing picture of plane of incidence, E is betterreﬂected if it’s perpendicular to that plane. If the two
angles in Snell’s law add to make a right-angle(90
degrees), the reﬂected light is 100% polarized (perp. to
incidence plane) at this and shallower skimming angles.
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