Physical Properties of Materials, Second Edition
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Movie 14: Polarizers

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Movie Script:

A polarizer cuts out some of the light from a light table. When a second polarizer is added, what we see depends on the relative orientations of the two polarizers. If they are oriented the same way, some light is blanked out. But if they are rotated so that they are in perpendicular orientations, as so-called crossed polarizers, all the light is cut out.

 

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