A mirror is a surface capable of reflecting light and clear enough to form an image.
The simplest example is the mirror plane. In it, a beam of parallel light rays can be reversed completely as a whole and continue to be a parallel beam and can thus produce a virtual image of an object with the same size and shape as the real. However, the image is inverted.
There are also concave mirrors and convex mirrors. When a mirror is concave and the curve is a parabola, a beam of parallel light rays converge at the focus. Conversely, a light source "point" located at the focus is reflected as a beam History
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mirrors as toilet utensils and manual object were widely used in Greek civilizations, Egyptian , Etruscan and Roman . Were made always with brushed metal, usually silver or bronze , this process is known as the audience. Plate had a round or oval, usually decorated with engravings or mythological reliefs on the back (the Romans lack of prints, but no relief) and carved handle to grasp comfortably while wearing, of which are preserved some museums are still many sites. During the high Middle Ages, hardly made use of the mirror until the thirteenth century invented the manufacturing of glass and rock crystal on foil (or lead amalgam or tin are silvered mirrors), while for this to be constructed of metal only to the eighteenth century .
as a true mirror room furniture can be argued that begins with the sixteenth century because although the two previous centuries lists some historic examples was barely known and their use was rare. In this century, is presented with elegant setting and artistic standing occupies a distinguished place in the classroom as movable object and small size. By the late seventeenth century factories Venetian mirrors fail to build large and since then uniquely serve as decorative objects in the classroom, in which figure prominently.
modern mirrors consist of a thin layer of aluminum deposited on a glass plate, which protects the aluminum and makes the most durable mirror. Folklore
The mirror has an important place in mythology and superstitions of many peoples. The image it reflects is often identified with the soul or spirit of the person: hence eg that vampires, bodies without soul, are not reflected in it. When a dying man is about to leave this world, it is common to cover the mirrors, for fear that the soul of the dying is enclosed in them.
The mirror is conceived and, as a window to the world of spirits. The urban legend of Veronica exemplary uses that vision. Conversely, the spirit world tends to be imagined as a specular counterpart of the living. Lewis Carroll masterfully develops the idea of \u200b\u200bmirror world as input to a reverse in the second part of the adventures of Alice.
The mirror is also a frequent subject of inquiry: he is deemed capable of displaying objects and events distant in time or space. In the story of Snow White, the mirror has the ability to speak and answer questions put to him by the stepmother. JRR Tolkien takes this tradition of magical mirror capable of displaying the future, in his famous mirror of Galadriel. In the novel Harry Potter and the Sorcerer's Stone, JK Rowling, appears the mirror Erised (Desire read in reverse), which reflects the image of the beholder, but their deepest desires
Courtesy: Andrea Carolina Yepes 7 º B
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