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When a light is analyzed, following observations are made. What is the nature of the light?

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When a light is analyzed, following observations are made. What is the nature of the light?

(a) Plane Polarized

(b) Circularly Polarized

(c) Elliptically Polarized

(d) Partially Polarized

This question was posed to me during an online interview.

The question is from Production of Circular and Elliptically Polarized Light in section Polarisation of Engineering Physics II

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The correct answer is (d) Partially Polarized

Explanation: When incident on a rotating prism, the intensity varies, with a minimum not equal to zero. Thus, it can be partially polarized or elliptically polarized. After passing through a quarter-wave plate, the intensity still varies with minimum not equal to zero. This means that it is partially polarized.

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