Question

explain why clear sky appears blue to the person on the surface of the earth and dark instead of blue to the person flying at very high altitude

Answer 1

The sky appears blue when viewed from Earth because of scattering of light particles I.e blue light gets refracted wherever there is atmosphere.

Answer 2

heya ......

since blue light have the shorter wavelength..when sunlight passes through the atmosphere, the fine particle of air scatter the blue colour more strongly than red.and the scattered blue light enters our eyes..

hope this helps