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By using Nicol prism, the emergent beam is ____________

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By using Nicol prism, the emergent beam is ____________

(a) Plane polarized

(b) Elliptically Polarized

(c) Circularly polarized

(d) Unpolarized

This question was addressed to me during an interview for a job.

My query is from Production of Circular and Elliptically Polarized Light topic in section Polarisation of Engineering Physics II

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The correct choice is (a) Plane polarized

The explanation: When an unpolarized beam is incident on a Nicol prism, it splits into two components – ordinary and extraordinary. The ordinary components are internally reflected and the emergent beam is plane-polarized.

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