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the earliest manufactured mirrors were pieces of polished stone such as obsidion a naturally occuring volcanic glass .mirrors of copper were crafted in mesopotamia from around 6000B.C .bronze mirrors were manufactured from around 2000B.C. mirrors made up of mixture of copper &tin are produced in china and india the invention of the silvered glass mirror is credited to german. glass mirrors backed with gold leaf were used by romans. metal coated glass mirrors are invented in sidon in first century A.D
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The history for spherical mirror goes to archimedes who first found its usage 
he used spherical mirror to destroy enemy ships by burning them by focusing sun rays on the ships by the mirrors.
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