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Polarising Filter's - Circular Or Linear

How to determine if a polarising filter is circular or linear

Hold a polarising filter in front of your eyes, facing the light. Now hold another polariser in front of it and rotate it slowly.
If it is a circular polariser, the rotation will cause the filter to black out on one side only, and not at all if the polariser is turned over.
If it is a linear polariser, it will black out when rotated to 90 degrees whether front on or back to front.

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