polarisation and polarised light


  • 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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