Why the Sun
does appear reddish at Sunrise and Sunset?
During
sunrise and sunset, ray of light from sun near the horizon passes through
thicker layer of air and large distance in the atmosphere. Sun rays consist of
seven colors in its light. Most of the
blue light and shorter wavelengths are scattered away by the particles and
therefore, light reaching our eyes is of longer wavelength (most of red light),
which gives reddish appearance to sun and sky.
According to
Rayleigh's law, the intensity of scattered light varies inversely as the fourth
power of its wavelength. If you observe a beautiful sunset on the moon, the
sun, would appear white. This is because the moon doesn’t have an atmosphere.
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