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If a ray is incident at 45° on a quarter-wave plate, the emergent light is ___________

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If a ray is incident at 45° on a quarter-wave plate, the emergent light is ___________

(a) Unpolarized

(b) Linearly Polarized

(c) Elliptically Polarized

(d) Circularly Polarized

I had been asked this question in an internship interview.

My enquiry is from Retardation Plates topic in chapter Polarisation of Engineering Physics II

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Right option is (d) Circularly Polarized

The best I can explain: If the light is incident at an angle of 45° on the quarter-wave plate, then the emergent light would be circularly polarized. If the angle is not 45°, then it would be elliptically polarized.

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