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Depolarization of light by an imperfect polarizer.

The intensity of originally unpolarized light passing through three linear polarizers from which the first two were identical and crossed was shown to be fully independent of the azimuthal angle of the third (testing) polarizer. This means that the second polarizer acts as a depolarizer of light polarized by the first one. We interpret the phenomenon phenomenologically on the basis of Mueller calculus in which polarized light is described by Stokes vectors