Question

distinguis between positiva and negative crystal​

Answer 1

Answer:

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Answer 2

positive crystal

:a doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as as quartz and ice

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negative crystal :

A uniaxial crystal, such as one of calcite, in which the extraordinary wave travels faster than the ordinary wave. A crystal that contains a cavity.

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