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(B) In double refraction (birefringence),a crystal like calcite splits an unpolarized light beam into two rays: the ordinary ray ($O$-ray) and the ext

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$A$ and $B$ are correct

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(B) In double refraction (birefringence),a crystal like calcite splits an unpolarized light beam into two rays: the ordinary ray ($O$-ray) and the extraordinary ray ($E$-ray).Statement $A$: The refractive index of the $E$-ray depends on the direction of propagation within the crystal,which is related to the angle of incidence relative to the optic axis. Thus,statement $A$ is correct.Statement $B$: Both the $O$-ray and the $E$-ray are plane-polarized,meaning the vibrations of light waves are restricted to a specific plane (one-sidedness). Thus,statement $B$ is correct.Therefore,both statements are correct.

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