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What are the uses of Polaroids ?

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Uses of Polaroids : 

(1) Polaroids can be used to control the intensity, in sunglasses, windowpanes, etc. 

(2) Polaroids are also used in photographic cameras and 3D movie cameras. 

Thus a polaroid transmits only one component (parallel to a special axis). The resulting light is called linearly polarised or plane polarised. When this kind of light is viewed through a second polaroid whose axis turns through 2π, two maxima and minima of intensity are seen. 

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