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# If the wavelength of light is doubled, by what fraction does the amount of the light scattered by Earth's atmosphere change? Is the amount of light scattered at the new wavelength larger or smaller than the amount of light scattered at the old wavelength?

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Light waves of different wavelengths in vacuum propagate at the same speed (c = 3 · 108 m / s), while in environments filled with atoms and molecules they move at different speeds. Therefore, the refractive index, which is defined as the quotient of the wave velocity u vacuum and velocity in a given medium, depends on the wavelength: This phenomenon is called light dispersion and is conditioned by the interaction of light waves with electrons in atomic and molecular shells. With increase light wavelengths, refractive index decreases. A spectrum is a set of electromagnetic waves of different wavelengths.

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