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Why does unpolarised light from a source...

Why does unpolarised light from a source show no variation in intensity when viewed through a polariod which is rotated? Show with the help of a diagram, how unpolarised light from sun gets linearly polarised by scattering.

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Polaroid films are produced by spreading ultramicroscopic crystals of herapathite on a thin sheet of nitrocellulse.The crystals are placed on the film by a special device is such a way that the optic axes of all the crystals are parallel. These crystals are highle dichoric and absorb one of the double refracted beams completely. The other refracted beam is transmitted from the crystals.
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CHHAYA PUBLICATION-DIFFRACTION AND POLARISATION OF LIGHT-CBSE SCANNER
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