Answers

2015-04-03T15:50:44+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
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. 
1 1 1
2015-04-04T09:22:50+05:30
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.
1 1 1