The mirror is made of the earliest pieces of shiny stones such as obsidian, a volcanic glass formed naturally. Obsidian mirrors found in Anatolia (now Turkey), from around 6000 BC. Polished stone mirrors from Central and South America from about 2000 SM.Cermin of shiny copper have been made in Mesopotamia in 4000 BC, and in ancient Egypt in 3000 BC. In China, bronze mirrors were made in 2000 BC.
Metal-coated glass mirror invented in Sidon (now Lebanon) in the first century AD, and the back of the mirror glass with gold leaf mentioned by the author of the Roman named Pliny in his book Natural History, which was composed around the year 77 AD The Romans also developed a technique of creating a rough mirror of glass blowing are coated with molten tin.
Metal-coated glass mirror invented in Sidon (now Lebanon) in the first century AD, and the back of the mirror glass with gold leaf mentioned by the author of the Roman named Pliny in his book Natural History, which was composed around the year 77 AD The Romans also developed a technique of creating a rough mirror of glass blowing are coated with molten tin.
Reflective parabolic mirror was first described by the physicist Ibn Sahl of Arab named in the 10th century. Ibn al-Haytham discussed concave and convex mirrors in spherical geometry and tube, do some experiments with mirrors, and solve the problems of finding the point on a convex mirror at which a ray coming from one point is reflected to another point. the 11th century, clear glass mirrors were produced in Al-Andalus.
In the early Renaissance, European manufacturers perfected a superior method of coating glass with a tin-mercury amalgam. The exact date and location of the discovery is unknown, but in the 16th century, Venice, a city known for its expertise making glass, a mirror production center by using this technique. Glass mirrors from this period were extremely expensive luxuries.
Justus Liebig discovered glass mirror in 1835. The process involves the deposition of a layer of metallic silver onto glass through the chemical reduction of silver nitrate. The process of coating glass with a reflective substance (silvering) is adapted to mass produce mirrors. Nowadays, mirrors are often produced by the vacuum deposition of aluminum (or sometimes silver) directly onto the glass substrate.
In the early Renaissance, European manufacturers perfected a superior method of coating glass with a tin-mercury amalgam. The exact date and location of the discovery is unknown, but in the 16th century, Venice, a city known for its expertise making glass, a mirror production center by using this technique. Glass mirrors from this period were extremely expensive luxuries.
Justus Liebig discovered glass mirror in 1835. The process involves the deposition of a layer of metallic silver onto glass through the chemical reduction of silver nitrate. The process of coating glass with a reflective substance (silvering) is adapted to mass produce mirrors. Nowadays, mirrors are often produced by the vacuum deposition of aluminum (or sometimes silver) directly onto the glass substrate.
The mirror was originally made of shiny metal strip or sheet, usually silver or copper metal are reflected back when the shadow is to be seen but also from other metals if only used to focus light.
Most moden mirrors consist of a thin layer of aluminum coated with glass pieces. This mirror is called "old rear" (back silvered), in which the surface bounces seen through shattered glass. Mirror with glass coating made resistant mirror, but the mirror because it reduces the quality of the mirror surface is usually added. Such mirror reverses about 80% of the incoming light. "The back of the 'mirror is often painted completely black to protect the metal from erosion.
Most moden mirrors consist of a thin layer of aluminum coated with glass pieces. This mirror is called "old rear" (back silvered), in which the surface bounces seen through shattered glass. Mirror with glass coating made resistant mirror, but the mirror because it reduces the quality of the mirror surface is usually added. Such mirror reverses about 80% of the incoming light. "The back of the 'mirror is often painted completely black to protect the metal from erosion.
Telescopes and other optical equipment which uses mirrors "old future" (front silvered), where the reflecting surface is placed on the surface of the glass, which gives a better quality of the shadow. Sometimes silver is used, but mostly uses aluminum mirrors, which reflect shortwave better of silver.
Old mirror reflects 90% front and 95% of the light comes.
Because of rusted metal in the presence of oxygen and moisture, the presence of old mirror surface needs to be replaced over and over to maintain quality. Another way is, of course, use the vacuum to put this mirror.
Old mirror reflects 90% front and 95% of the light comes.
Because of rusted metal in the presence of oxygen and moisture, the presence of old mirror surface needs to be replaced over and over to maintain quality. Another way is, of course, use the vacuum to put this mirror.
(various source)
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