Question
Why is the clear sky blue?
✓
Answer
The molecules of air and other fine particles in the atmosphere are smaller in size than the wavelength of light in the visible region.
The wavelength of red light is about $1.8$ times that of blue light.
When the sunlight passes through the atmosphere, the fine particles in the air scatter blue light more strongly than red light.
At this time if the observer looks upwards, he finds sky blue.
If the earth had no atmosphere, there would not have been any scattering. Then the sky would have looked dark.
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