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Polaroid filters block light traveling in the horizontal plane. Essentially, the filter only allows light that's traveling vertically to get past the lens. Polaroid filters are often used on sunglasses.

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Polaroids are the collection of micro crystals that are used to control the propagation of light. As we all know, light is a wave that propogates with a speed of 3 x 108 m/s. It vibrates in all direction. If a light passes through a Polaroid, light polarised parallel is absorbed, and only the light polarised perpendicular are transmitted.

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