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In the Nicol Prism experiment, the calcite crystal length is x times its breadth. What is x?

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In the Nicol Prism experiment, the calcite crystal length is x times its breadth. What is x?

(a) 2

(b) 3

(c) 1/2

(d) 1/3

The question was asked by my college director while I was bunking the class.

This intriguing question originated from Nicol Prism in portion Polarisation of Engineering Physics II

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The correct option is (b) 3

The explanation: In this experiment, a calcite crystal whose length is three times its breadth is taken. The calcite crystal is the doubly refracting crystal that splits the unpolarized light into two plane-polarized beams.

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