Light Beams through Multiple Polarizers

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In this Demonstration, you can observe the changes in intensity of a light beam as you vary the angles of two or three polarizers.

Contributed by: S. M. Blinder (March 2011)
Open content licensed under CC BY-NC-SA



Snapshot 1: parallel polarizers: full transmission of light beam

Snapshot 2: crossed polarizers: no transmitted light

Snapshot 3: insertion of third polarizer with intermediate orientation: some light gets through now! maximum when θ=45°

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