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noun, Optics.
the scattering of light by particles that are very small in relation to the wavelength of the light, and in which the intensity of the scattered light varies inversely with the fourth power of the wavelength.
a process in which electromagnetic radiation is elastically deflected by particles of matter, without a change of frequency but with a phase change
Rayleigh scattering
The scattering of electromagnetic radiation by particles with dimensions much smaller than the wavelength of the radiation. The frequency of the radiation is not altered by this form of scattering, though the phase of the light is usually changed. Because the amount of Rayleigh scattering is greater at shorter frequencies, more scattering of the sun’s rays by the Earth’s atmosphere occurs on the blue end of the spectrum than at the red end, thus more blue light reaches the Earth, and the sky generally appears blue. Compare Raman effect. See also Compton effect.


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  • Rayless

    [rey-lis] /ˈreɪ lɪs/ adjective 1. lacking or raylike parts. 2. unlit, dark, or gloomy: a rayless cave. /ˈreɪlɪs/ adjective 1. dark; gloomy 2. lacking rays: a rayless flower

  • Raylet

    /ˈreɪlɪt/ noun 1. a small ray

  • Raymond

    [rey-muh nd] /ˈreɪ mənd/ noun 1. Henry Jarvis [jahr-vis] /ˈdʒɑr vɪs/ (Show IPA), 1820–69, U.S. publicist: founder of The New York Times. 2. a male given name: from Germanic words meaning “counsel” and “protection.”. masc. proper name, from Old French Raimund, from Frankish *Raginmund “counsel-protection” or “might-protection,” from ragin “counsel, might” + mund “hand, protection” […]

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