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Why does sky look blue on a clear day?

Answer» Due to scattering of light
Because in the surface of Earth seen blue colour from atmosphere then blue colour reflected in sky. So the scattered blue light enters our eyes.
When the sunligth passes through the atmosphere the fine particles in air scatter the blue colour (shorter wavelengths) more stongly than red . The scattered blue light enters our eyes .
Becoz of scattering of blue and violet colour the most


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