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9. When a Polaroid is rotated, the intensity of light varies and ultimately reduces for a particular orientation to zero. It shows that the incident light is (1) completely plane polarised (2). partially plane polarised (4) unpolarised (4) None of the above.

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9. When a Polaroid is rotated, the intensity of light varies and ultimately reduces for a particular orientation to zero. It shows that the incident light is (1) completely plane polarised (2). partially plane polarised (4) unpolarised (4) None of the above.
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Answer : (c) partially plane polarised

Explanation: Polaroid cuts off plane polarised light for one orientation

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