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Question

Assertion :When light ray is incident at polarising angle on glass, reflected light is completely polarised. Reason: The intensity of light decreases in polarisation.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
When light is incident at polarising angle, a particular component of electric field vector (i.e., a particular polarisation) completely passes to the other medium. Thus, the reflected light is completely polarised. Intensity decreases in polarisation. When unpolarised light is passed through one polariser, the intensity is reduced to half. So assertion is correct and reason is also correct but reason is not the correct explanation of assertion.

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