A) scattering
B) diffraction
C) dispersion
D) all of these.
Correct Answer: A
Solution :
On a clear atomsphere, the scattering centres are mainly the air molecules whose dimension is of the order of the wavelenth of light. We know that amount of scattering is proportional to \[\frac{1}{{{\lambda }^{4}}}\] . Hence red light is the least scattered and more scattering occurs towards the blue end of the spectrum. And on a clear day, as light (blue end) is scattered uniformaly, the sky appears blue.
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