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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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To detect the given light, it should be passed through a polaroid and is rotated about the incident light : (1) If on rotating the polaroid through one complete rotation, there is no change in the intensity of the emergent light, then the given light is unpolarised, (2) If there is a change in the intensity of emergent light in one complete rotation of the polaroid, the intensity becomes twice maximum and twice zero, then the given light is completely planepolarised, (3) If the intensity of emergent light changes but never becomes zero, then the given light is partially polarised.
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