The birefracting crystal ordinary rays travels faster than extraordinary rays. The crystal is called

positive crystal

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negative crystal

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no such demarcation exists

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dextro rotatory

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leveo rotatory.

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Solution

The correct option is C positive crystal
A positive crystal is one in which index of refraction for extraordinary ray is greater than that for ordinary ray. Hence ordinary ray travels faster than extraordinary ray in positive crystal

Answer. A) Positive crystal.

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v_{o}

V_{E}

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v_{o r d i n a r y} > v_{e x t r a o r d i n a r y}

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