Question

why do sky appears blue

Answer 1

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun.
we see red and orange colours because the blue light has been scattered out and away from the line of sight.
this may help you

Answer 2

Due to atmospheric refraction..

A clear cloudless day-time sky is blue because molecules in the air scatter blue 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 blue light has been scattered out and away from the line of sight.

Hope it helps you my dear friend..

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