what is mean by ray?
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In optics a ray is an idealized model of light, obtained by choosing a line that is perpendicular to the wavefronts of the actual light, and that points in the direction of energy flow.
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Explanation:
a: any of the lines of light that appear to radiate from a bright object
b: a beam of radiant energy (such as light) of small cross section
c(1): a stream of material particles traveling in the same line (as in radioactive phenomena)
(2): a single particle of such a stream
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