Circular polarizers are created by combining a linear polarizer and a quarterwave retarder. The incoming light is first polarized linearly and before being rotated by a 45° retarder. This causes the vector of the light to rotate.
When light which is polarized circularly reflects off of a surface, the orientation of the light is reversed. In that case, if the light returns back to a circular polarizer of the same orientation it will be completely absorbed. This technique is used to eliminate reflections from displays and screens as well as to separate two channels of light for a 3D effect.
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