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v(O) and v(E) represent the velocities, ...

`v_(O)` and `v_(E)` represent the velocities, `mu_(O) and mu_(E)` the refractive indices of ordinary and extraordinary rays for a doubly refracting cystal. Then

A

`v_0 ge v_E, mu_0 le mu_E` the crystal is calcite

B

`v_0 le v_E, mu_0 le mu_E` if the crystal is quartz

C

`v_0 le v_E, mu_0 ge mu_E` if the crystal is calcite

D

`v_0 ge v_E, mu_0 ge mu_E` if the crystal is quartz.

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