Mirror

Do you ever see a double in a mirror?

A mirror, once known as a ‘looking glass’, is an invented object that reflects any light directed onto it, which results in the object reflecting an image.
Both flat and curved mirrors are available, and the latter are able to manipulate light and images depending on the curve extremity.
Mirrors are commonly used to look at one’s appearance; as an ornament or part of a building, often to make spaces look larger; and in some machines, including telescopes, to manipulate light.
In ancient times, natural items were used to observe reflections in a similar way to mirrors, such as glossy stones and water.
Handheld mirrors are believed to have been used around 6000 BC, and were commonly made of polished obsidian, and metals were used some time later.

The modern mirror is believed to have been invented in the early to mid 1800s, by the German Justus von Liebig, a chemist, who developed a silvering process that eventually superseded the hazardous mercury backed items that had been used for centuries.
Modern mirrors are usually made by coating the underside, of what most commonly is glass, with thin reflective layers, that often include layers of tin chloride, silver, copper, and a chemical activator, while paint is often used to seal and protect the back.
Mirrors are used in vehicles to display a wider view of the surroundings, as well as to see behind, and different shapes are used for various vehicles, to maximise the visibility.
Not many animals can recognise their own image in a mirror, and only great apes, elephants, bottlenose dolphins, orcas and Eurasian magpies are believed to have the ability.
Mirrors are popularly used in art, as well as to entertain, and are used in kaleidoscopes, mazes and disco balls.

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