Define dispersion and Atmosphere refraction
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The spreading is due to the fact that the index of refraction of the glass depends on the wavelength of the light. ... This dependence of the refractive index on wavelength (or frequency) is called dispersion, and is the source of several beautiful atmospheric colour phenomena
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Dispersion↪The separation of white light into colours or of any radiation according to wavelength.
Atmosphere refraction↪Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. ... Astronomical or celestial refraction causes astronomical objects to appear higher above the horizon than they actually are.
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