Which of the following is used for making optical instruments?

Which of the following is used for making optical instruments?
  1. $\mathrm{SiO}_2$
  2. $\mathrm{Si}$
  3. $\mathrm{SiH}_4$
  4. $\mathrm{SiC}$

Solution

Silica $\left(\mathrm{SiO}_2\right)$ is used for making optical instruments.

Asked in: AP EAMCET 2006

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