1) How does polarized light differ from the ordinary light?
Ans: Polarization is the direction of oscillation of the electric field in an EM wave. Ordinary (unpolarized) light has random polarization, meaning it will have statistically equal components of
polarization in any direction. Polarized light has coherent polarization, meaning the polarization is in one constant direction for the light (polarization can be linear, circular, or elliptical). Light can be partially polarized as well.
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