Which of the following is used for making optical instruments ?

S i O_{2}

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S i

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S i H_{4}

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N o n e

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Solution

The correct option is A $S i O_{2}$
Flint glass which is a mixture of silicates of potassium and lead $(K_{2} O . P b_{2} O .4 S i O_{2})$ . It is used for making optical instruments.

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