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Ultraviolet   Listen
adjective
Ultraviolet  adj.  (Physics) Lying outside the visible spectrum at its blue-violet end; said of light more refrangible (i. e. having a shorter wavelength) than the extreme violet rays of the visible spectrum. Electromagnetic radiation with wavelengths shorter than those of ultrviolet light are not usually considered as light waves, but are classified differently. The ultraviolet region of the electromagnetic spectrum is generally considered as comprising those electromagnetic emissions with wavelengths lying between those of visible light and those of X-rays, i. e. between 4000 Angstroms and 100 Angstroms.






Collaborative International Dictionary of English 0.48








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"Ultraviolet" Quotes from Famous Books



... you have photographed you must develop the film. And there is no time for that aboard a fast steamer running through the ice and the fog. No, it is mere theory, but I have an idea that the ultraviolet light—the actinic rays beyond the violet end of the spectrum, you know—will penetrate fog to a great distance, and in spite of its higher refractive power, which would distort and magnify an object, it is better ...
— The Grain Ship • Morgan Robertson

... to use his ultraviolet pencil-light to bring it to him, and dial for the brandy-and-soda he wanted. As long as that was necessary, there really wasn't anything to worry about. But some of these days, they'd build robots that would anticipate orders, and robots to operate robots, and robots ...
— A Slave is a Slave • Henry Beam Piper

... bright objects projected against them, and he went on to show that the higher above the sea level the observer went, the darker the sky really is and the fainter the spectrum. In fact, the latter shows but little more than a band in the violet and ultraviolet at a height of 8,500 feet, while at sea-level it shows nearly the whole photographic spectrum. The only reason of this must be particles of some reflecting matter from which sunlight is reflected. The author refers this to watery stuff, of which nine-tenths is left ...
— Scientific American Supplement, No. 363, December 16, 1882 • Various



Words linked to "Ultraviolet" :   ultraviolet source, sun-ray, invisible, ultraviolet lamp, actinic ray, ultraviolet light, ultraviolet spectrum



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