Answer:
Scattering of light is the phenomenon of spreading of light in all directions by minute particles in a medium. The sky appears blue because the blue colour of sunlight due to its shorter wavelength scatters much more strongly than the other colour by particles in the atmosphere. At sunrise and sunset, most of the blue light and other shorter wavelength light is scattered away by the particles in the atmosphere as the light from the sun has to travel comparetively larger distance. Therefore, light that reaches us is of longer wavelength, thus giving a reddish appearance.
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