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  4. For a doubly refracting crystal, the refractive indices of ordinary and extraordinary rays are denoted by n 0 and n e respectively. Which of the relations is valid along the optic axis of the crystal?

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Q. For a doubly refracting crystal, the refractive indices of ordinary and extraordinary rays are denoted by $n _{0}$ and $n _{ e }$ respectively. Which of the relations is valid along the optic axis of the crystal?

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Solution:

Correct answer is (c) $n_{0}=n_{e}$