Hi,

Polarisation is the property of wave that can oscillate with more than one orientation. A light wave that is vibrating in more than one plane is referred to as unpolarised light. The process of transforming unpolarized lights into polarized light  is known as polarisation of light. It can be even made by reflection.

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Hello!!

A light wave that is vibrating in more than one plane is referred to as unpolarized light. ... Polarized light waves are light waves in which the vibrations occur in a single plane. The process of transforming unpolarized light into polarized light is known as polarization

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