1.

The sky appears reddish at the sunset due to the fact, that

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blue-violet light has been scattered least.
red light is scattered most.
blue light has been mostly scattered but red light has scattered the least.
for red light the angle of refraction is less than for blue light.

Solution :At sunset (and at sunrise too) the sun appears to be of reddish colour because blue light is mostly scattered before REACHING the observer.s EYE but red light is scattered the least. In fact, amount of scattering is inversely PROPORTIONAL to fourth power of the WAVELENGTH of light.


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