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Light waves that are restricted to vibrate in one plane and at right angles to their direction whereas non polarised light is random.
A filter with a grey appearance that (partially) blocks polarised light. It's used in front of the lens to reduce glare and enrich colours. There are linear and circular polarising filters. Circular polarising filters work best with autofocusing systems. These filters rotate in their mount, by which method the photographer controls the amount of polarised light that reaches the film or sensor. Keep in mind that a polarising filter only works when used at an angle to the light. When shooting landscapes, for instance, try to shoot at an angle of about 90 degrees to the sun.