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When a circularly polarized light falls on a quarter wave plate, it changes into a __________

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When a circularly polarized light falls on a quarter wave plate, it changes into a __________

(a) Unpolarized light

(b) Elliptically Polarized Light

(c) Plane Polarized light

(d) No change

The question was asked during an online interview.

The above asked question is from Production of Circular and Elliptically Polarized Light topic in division Polarisation of Engineering Physics II

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Correct option is (c) Plane Polarized light

For explanation: This method is used to distinguish between unpolarized light and a circularly polarized light. When both of them are incident on a quarter-wave plate, a circularly polarized light gets converted into a plane-polarized light while the unpolarized light remains unchanged.

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