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the earlier manufactured mirrors were the pieces of polished stones. parabolic mirrors were described and studied in classical antiquity by the mathematician diodes in his work on burning mirrors. In china people began making mirrors with the use of silver mercury amalgams as early as 500AD. In 16th century, venice, a big city formed for its glass making expertise, became a centre of mirror production using this new technique. 
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In early times still or dark water collected in a vessel was used as mirrors by ancient people.As years passed obsidian mirrors came in to existence followed by metal coated glass mirrors this led to discovery of metal coated spherical mirrors.  A spherical mirror is the shape of a piece cut out of a spherical surface. It has two types : concave, and convex.
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