Answer:
The blue colour of clear sky is due
to Rayleigh scattering of sunlight. The molecules of air and other fine
particles in the atmosphere have size smaller than the wavelength of visible light.
These are more effective in scattering light of shorter wavelengths at the blue
end than light of longer wavelengths at the red end.
The red light has a wavelength about 1.8
times greater than blue light, Thus, when sunlight passes through the
atmosphere, the fine particles in air scatter the blue colour (shorter wavelengths)
more strongly than red. The scattered blue light enters our eyes and we see, colour
of sky is blue.
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