The sky appears dark to passengers flying at very high altitudes mainly because:(a) Scattering of light is not enough at such heights.(b) There is no atmosphere at great heights.(c) The size of molecules is smaller than the wavelength of visible light.(d) The light gets scattered towards the earth.
(a) Scattering of light is not enough at such heights.
Explanation
The sky appears dark to passengers flying at very high altitudes mainly because the scattering of light takes place due to the particles present in the atmosphere, and at a higher altitude, the atmospheric medium is very rarer so the scattering of light taking place is very low. Hence, the sky appears dark to passengers flying at high altitudes.
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