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How will you identify with the help of a...

How will you identify with the help of an experiment whether a given beam of light is of polarized light or of unpolarised light?

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In order to detect whether the given light is ordinary (unpolarised) light or plane polarised, pass it through polariser. Now, the polariser is rotated keeping the light normal to the plane of the polariser.

(a) If on complete rotation, there is no change in the intensity of the emerging light, it is unpolarised (ordinary) light.
(b) If the intensity of light changes (gradually varies between maximum and zero twice) in one rotation, then the given light is plane- polarised.
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