Answer:
The reddish appearance of the sun at
sunrise or sunset is due to scattering of light by the molecules of air and
other fine particles in the atmosphere have size smaller than the wavelength of
visible light from the sun near the horizon. It passes through thicker layers
of air and larger distance in the earth's atmosphere before reaching our eyes
and most of the blue light and shorter wavelengths are scattered away by the
particles.
So, only red light, being of higher
wavelength reaches us which gives reddish appearance of sun at sunrise or
sunset.
At noon, the sun appears white,
not red, as only a little of the blue and violet colours are scattered as light
from the Sun overhead would travel relatively shorter distance.
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