Wednesday, April 24, 2013

Mirror: A look at the world upside down


The man was endowed with the gift of sight. Through our eyes we see the outcome of life on earth. Even with telescopic technology, we are apt to see far beyond our celestial body and observe the development of the universe itself. However, we are naturally unable to see ourselves. The mirror (which in its broadest sense includes surfaces such as water), is the "instrument" oldest, albeit inverted, allowed us to satisfy our curiosity.
A mirror is a polished surface on which the light strikes is reflected following the laws of reflection. In a plane mirror, a beam of parallel light rays can completely change direction together and remain a beam of parallel rays, and can produce a virtual image of an object with the same size and shape as the real one. The picture is right but reversed on the axis normal to the mirror.
There are also concave mirrors and convex mirrors that distort the real picture.
The mirrors and toilet utensils and manual were widely used object in the Egyptian, Greek, Etruscan and Roman. They were made with burnished metal always, usually copper, silver or bronze. In the thirteenth century invented the manufacture of glass and rock crystal on metal foil. The mirror like room furniture begins with the sixteenth century. It comes with stylish frame and standing artistic and occupies a distinguished place in the lounge as movable object and reduced dimensions. By the late seventeenth century Venetian factories fail to build large mirrors and since then served as singularly decorative objects in the classroom, in which figure prominently.
Modern mirrors consist of a thin layer of silver or aluminum deposited on a glass plate, which protects the metal and causes the mirror more durable.
Did you know ... With the invention of photography in the nineteenth century, for the first time the man is able to see exactly what is in reality, because unlike a mirror, does not reverse images?

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