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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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Spherical Mirrors A spherical mirror is a mirror which has the shape of a piece cut out of a spherical surface. There are two types of spherical mirrors: concave, and convex. These are illustrated in Fig. 68. The most commonly occurring examples of concave mirrors are shaving mirrors and makeup mirrors.
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