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কোনটি অপটিক্যাল গ্লাস?

N a_{2} O . K_{2} O . C e_{2} {O_{2}}^{-} \times S i O_{2}

N a_{2} O . K_{2} O . P b O_{3} \times S i O_{2}

K_{2} O . C a O \times S i O_{2}

কোনটিই নয়

ANS : 3

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