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For a double refracting crystal, the ref...

For a double refracting crystal, the refractive indices for the ordinary and extraordinary rays are denoted by `n_0` and `n_e` .Which of the following relations is valid along the optical axis of the crystal ?

A

`n_0 =n_e`

B

`n_0 lt n_e`

C

`n_0 gt n_e`

D

`n_0 gt/lt n_e`

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