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Question

silver is very expensive but mirror are cheap then really sliver is used in making mirror

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Solution

Silver metal is one of the best reflectors of light. So, ordinary mirrors are made by depositing a thin layer of silver metal on one side of a plane glass sheet. The silver layer is then protected by a coat of red paint. The reflection of light in a plane mirror takes place at the silver surface in it. Thus, a plane mirror is a thin, flat and smooth sheet of glass having a shining coating of silver metal on one side.

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