Question

why do Sky appear blue?

Answer 1

When we look at an arbitrary point in the sky, away from the sun, we see only the light that was redirected by the atmosphere into our line of sight. Because that occurs much more often for blue light than for red, the sky appears blue. Violet lightis actually scattered even a bit more strongly than blue.

Answer 2

When will look in arbitrary point of sky away from the Sun we see only The Light That was redirected by the atmosphere into our line of sight, because that occurs much more often the blue light is then red, that's why sky appears blue