The torch is lit before each Olympics by the sun's rays in a concave mirror in a ceremony at Ancient Olympia, where the games were born nearly 3, 000 years ago.
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Many variations are possible : collimation can be done with concave mirrors, dispersion can be achieved with glass prisms, and scanning can be achieved with fixed slits and spinning square prisms.
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Rain and sporadic snowstorms in the mountains around this idyllic valley forced Greek and Japanese Olympic officials to light the flame last Monday, using the sun's rays reflected in a concave mirror.
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The rehearsal is for Thursday's ceremony _ held on Greek independence day _ at ancient Olympia, in southern Greece, when the flame will be lighted from the sun's rays using a concave mirror.
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As the observer moves, the light from the concave mirrors or silver leaf changes and the whole painting takes on new images and changes of colors that are created by the observer ."
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Stewart punctured the surface of the canvases and placed concave mirrors behind the openings, or on occasion he painted on a silver leaf surface, leaving the silver exposed to function like a mirror.
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The torch is lit before each Olympics by the rays of the sun in a concave mirror in a ceremony at Ancient Olympia, where the games were born nearly 3, 000 years ago.
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In this work he described his discovery of the peculiarities of the diffraction of light rays reflected by a concave mirror and how they might be stopped by a board pierced in the middle.
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Hockney had argued that the chandelier was too perfect to have been produced by hand and eye alone and that van Eyck probably used a concave mirror to project an image onto the canvas.
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The projection unit in a typical HUD is an optical collimator setup : a convex lens or concave mirror with a Cathode Ray Tube, light emitting diode, or liquid crystal display at its focus.
