What is the chemical composition of Nicol's prism?

{A l}_{2} O_{3}

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C a S O_{4}

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C a C O_{3}

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{N a}_{3} A l F_{6}

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Solution

The correct option is C $C a C O_{3}$
A Nicol prism is a type of polarizer, an optical device used to produce a polarized beam of light. It is made in such a way that it eliminates one of the rays by total internal reflection, i.e the ordinary ray is eliminated and only the extraordinary ray is transmitted through the prism.
It consists of a rhombohedral crystal of Iceland spar (a variety of calcite $(C a C O_{3})$ ). Or in other words Nicol clear, block-like crystals of calcium carbonate

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