A calcite crystal is placed over a dot on a p | vedclass

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(D) Calcite is a birefringent (doubly refracting) crystal. When light from the dot passes through the calcite crystal,it splits into two rays: the ord

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One dot rotating about the other

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(D) Calcite is a birefringent (doubly refracting) crystal. When light from the dot passes through the calcite crystal,it splits into two rays: the ordinary ray ($o$-ray) and the extraordinary ray ($e$-ray). As the crystal is rotated,the $o$-ray remains stationary because its refractive index is independent of the direction of propagation. However,the $e$-ray's refractive index depends on the direction of propagation,causing its image to rotate around the stationary $o$-ray image. Therefore,one will see one dot rotating about the other.

$A$ calcite crystal is placed over a dot on a piece of paper and rotated. On seeing through the calcite,one will see:

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