Waveplate
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A waveplate or retarder is an optical device that alters the polarization state of a light wave travelling through it. Two common types of waveplates are the half-wave plate, which rotates the polariz
A waveplate mounted in a rotary mount
Thin crystalline film of caesium chloride photographed using a petrographic microscope
Polarizer
Videos
A polarizer or polariser is an optical filter that lets light waves of a specific polarization pass through while blocking light waves of other polarizations. It can filter a beam of light of undefine
A polarizing filter cuts down the reflections (top) and makes it possible to see a photographer through the glass at roughly Brewster's angle although reflections off the back window of the car are not cut because they are less-strongly polarized, according to the Fresnel equations.