parallel rays

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par·al·lel rays

rays parallel to the axis of an optic system.
References in periodicals archive ?
Previous analyzers could resolve only a very intense X-ray beam, a beam of a single wavelength, or a beam of highly parallel rays.
The synchrotron is not movable, soinstead of moving the X-ray source around the sample, they rotate the sample on a turntable, while the radiation coming in an array of parallel rays passes through it.

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