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Polarisation is the process by which the oscillations are made to occur in one plane only. This is done by passing the waves through a 'grid' so that only the waves that can fit through the slits can continue through: This idea is used in Polaroid glasses to reduce the amount of light able to reach the eye.
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It is the phenomena in which when light wave move in one plain property  of certain electromagnetic radiation in which the direction and magnitude of the vibrating electric field are related in a specified way .
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