Explain Malus law, Malus' law (E.L. Malus): The light intensity I of a ray with primary

Explain Malus law

Malus' law (E.L. Malus): The light intensity I of a ray with primary intensity I0 travelling via a polarizer at an angle theta among the polarization of the light ray and the polarization axis of the polarizer is specified by:

I = I₀ cos² theta.

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