Question

why the sky is blue in colour??

Answer 1

A clear cloudless day-time sky is bluebecause molecules in the air scatterblue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the bluelight has been scattered out and away from the line of sight.

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Answer 2

because molecules in the air scatter blue light from the sun more than they scatter red light.