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# Which of the following is used for making optical instruments?

$\begin {array} {1 1} (a)\;SiO_2 & \quad (b)\;Si \\ (c)\;SiH_4 & \quad (d)\;SiC \end {array}$
Can you answer this question?

$(a) SiO_2$
answered Nov 7, 2013 by