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xray glasses

Comprehensive Analysis

1) "Xray" -- As to xray glasses Xray Pronunciation: 'eks-"rA -- a communications code word for the letter x Pronunciation Symbols An X-ray picture (radiograph), taken by Wilhelm Röntgen in 1896, of Albert von Kölliker's hand. X-rays (or Röntgen rays) are a form of electromagnetic radiation with a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 to 30 000 PHz (1015 hertz). X-rays are primarily used for diagnostic radiography and crystallography. X-rays are a form of ionizing radiation and as such can be dangerous. In many languages it is called Röntgen radiation after the investigator of the radiation, Wilhelm Röntgen. 1 Physics 2 Detectors 2.1 Photographic Plate 2.2 Photostimulable Phosphors (PSPs) 2.3 Geiger counter 2.4 Scintillators 2.5 Image Intensification 2.6 Direct Semiconductor Detectors 2.7 Scintillator + semiconductor detectors (indirect detection) 2.8 Visibility to the human eye 3 Medical uses 4 Other uses 5 History 5.1 Tesla 5.2 Fernando Sanford 5.3 Hertz 5.4 Röntgen 5.5 Edison 5.6 The 20th century and beyond 6 See also 7 References 8 External links X-rays are a type of electromagnetic radiation with wavelengths of around 10-10 meters. When medical X-rays are being produced, a thin metallic sheet is placed between the emitter and the target, effectively filtering out the lower energy (soft) X-rays. This is often placed close to the window of the X-ray tube. The resultant X-ray is said to be hard. Soft X-rays overlap the range of ext..." 2) "Glasses" -- As to xray glasses 1glass Pronunciation: 'glas, 'gläs Function: noun Usage: often attributive Etymology: Middle English glas, from Old English glæs; akin to Old English geolu yellow -- more at YELLOW 1 : any of various amorphous materials formed from a melt by cooling to rigidity without crystallization: as a : a usually transparent or translucent material consisting typically of a mixture of silicates b : a material (as obsidian) produced by fast cooling of magma 2 a : something made of glass: as (1) : TUMBLER; also : GLASSWARE (2) : MIRROR (3) : BAROMETER (4) : HOURGLASS (5) : BACKBOARD 1 b (1) : an optical instrument or device that has one or more lenses and is designed to aid in the viewing of objects not readily seen (2) : FIELD GLASSES, BINOCULARS -- usually used in plural c plural : a device used to correct defects of vision or to protect the eyes that consists typically of a pair of glass or plastic lenses and the frame by which they are held in place -- called also eyeglasses, spectacles 3 : the quantity held by a glass container 4 : FIBERGLASS - glass·ful /'glas-"ful/ noun - glass·less /-l&s/ adjective Pronunciation Symbols A pair of modern glasses A pair of more traditional glasses Glasses, spectacles, or eyeglasses are frames-bearing lenses worn in front of the eyes normally for vision correction or eye protection or for protection from UV rays. Special glasses are used for viewing three-dimensional images from two-dimensional displays or experiencing virtual reality. Modern glasses are typically supported by pads on the bridge of the nose and by temples placed over the ears. Historical types include the pince-nez, monocle, and lorgnette. Glasses frames are commonly made from metal, horn or plastic. Lenses were originally made from glass, but many are now made from various types of plastic, including CR-39 or polycarbonate. These materials reduce the danger of breakage and weigh less than glass lenses. Some plastics also have more advantageous optical properties than glass, such as better transmission of visible light and greater absorption of ultraviolet light. Some plastics have a greater index of refraction than most types of glass; this is useful in the making of corrective lenses shaped to correct vision abnormalities such as myopia, allowing thinner lenses for a given prescription. Scratch-resistant coatings can be applied to most plastic lenses giving them similar scratch resistance to glass. Hydrophobic coatings designed to ease cleaning are also available, as are anti-reflective coatings intended to improve night vision and make the wearer's eyes more visible. Polycarbonate lenses are the lightest and most shatterproof, making them the best for impact protection. Polycarbonate lenses offer poor optics because of a low Abbe number of 31. CR-39 lenses are the most common plastic lenses, due to their low weight, high scratch resistance and low transparency for ultra violet and infared radiation. Some glasses are not designed for vision correction. Safety glasses are a kind of eye protection against flying debris or against visible and near visible light or radiation. Sunglasses allow better vision in bright daylight, and may protect against damage from high levels of ultraviolet lig..." 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