Light wave is said to be polarised when the vibration of its electric vector are confined to one direction in plane perpandicular to its direction of propagation.
When light is polarised its intensity reduces to 50% of the intensity of unpolarised lighy.
when we pass a polarised light through a polaroid and we rotate the polaroid about the direction of propagation of the light then the intensity of light changes as per the Law of Malus where intensity I=I0cos2θ
Polarised light can be obtained by reflection , refraction and scattering of unpolarised light.
Polarisation of light can only be detected by a polaroid.
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