parallel rays


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parallel rays

[¦par·ə‚lel ′rāz]
(mathematics)
Two rays lying on the same line or on parallel lines.
Two rays that lie on the same line or on parallel lines, and point in the same direction.
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References in periodicals archive ?
Furthermore, the result of the device performance may be affected by the locations of the observer because the lights which the observer received are not always parallel rays. We use a point receiver to represent the observer and calculate the light traces with the point receiver placed at different locations.
A Simple Unidirectional Optical Invisibility Cloak Made of Water
"It is most intense when focused on a single point rather than beamed in parallel rays. But a laser that focuses less sharply, in more of a long X shape rather than a short X shape, could still do the business.
Will we ever see the light?; Star Wars has cutting edge technology we might make work in the new millennium says science writer Jim McLean
If a dichroic mirror is used, for example, there are fewer deviations resulting from differences in the angles of rays passing through the center or off-center, since the dichroic mirror design is based on the principle of parallel rays.
Infinity optics can make a difference
Two parallel rays from the top and bottom of the object are refracted at the front surface of the eye, cross a short distance behind its geometrical centre, at a point referred to by Gaukroger as the focus, and then diverge again to produce an inverted image on the retina.
Descartes: An Intellectual Biography
Previous analyzers could resolve only a very intense X-ray beam, a beam of a single wavelength, or a beam of highly parallel rays. Coauthor Timm Weitkamp of the European Synchrotron Radiation Facility in Grenoble, France, says the new gratings can handle the less intense, multiwavelength, and multidirectional beams that emerge from typical hospital X-ray tubes.
X ray excels: technique brings a new image to medicine
In a flat universe, parallel rays stay parallel forever on the largest scales.
Galaxy clusters
South of Mare Crisium in Mare Fecunditatis are two small craters with unique parallel rays streaming from one of them.
Messier on the Moon

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