Answer very shortly:
On a clear day, Meena notices that the sky looks blue even though sunlight is white. She wonders how sunlight changes colour as it passes through the atmosphere.
Based on this observation, explain what scattering of light is and why the clear sky appears blue.
When enters the Earth's atmosphere, it is in all possible directions by the of various gases present. This is known as scattering of light.
A clear sky is blue because molecules in the air scatter from the sun more than they scatter .