Commercial Polaroid filters on an OHP.

Commercial Polaroid filters on an OHP. 1. Big Polaroid and rotateable Polaroid in the parallel position: light is transmitted in the overlapping section. 2. Big Polaroid and rotateable Polaroid in the crossed position: no light is transmitted in the overlapping section. 3. Small Polaroid inserted between Big Polaroid and rotateable Polaroid in the crossed position: light is transmitted in the overlapping section.
UCB Index: 
E+45+25
PIRA Index: 
6H10.10
Demo Diagram: 
Video: 

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