- The colour of the sky and the Sun's colour at sunrise/sunset are due to the interaction of sunlight with atmospheric particles. - This interaction involves scattering of light. - Shorter wavelengths (blue) are scattered more effectively than longer wavelengths (red) by atmospheric gases (Rayleigh scattering). - The path length of sunlight through the atmosphere affects which colours are predominantly seen.
The blue colour of the sky and the reddening of the Sun at sunrise and sunset are caused due to the phenomenon of :
Asked in UPSC CISF AC EXE 2022 · Topic: Optics (Diffraction: Fraunhofer and Fresnel diffraction, diffraction grating)
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