"Picket-Fence" pictorial representation



Partial transmission using 3 polarizing filters

Explanation: The first filter allows light parallel or with a parallel component to the filter's orientation (the orientation of the long polymer molecules) to pass. The middle filter allows a component along its orientation to pass through. Because of the middle filter, light that reaches the third and top filter is no longer at right angles to the top filter, as it was before, but is rather oriented at the angle of the middle filter. As a result, a component of the middle filter's component is allowed to pass through the top filter. Instead of a dark square, we see some light passing through the polarization sandwich. 

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