Why does the bluish colour predominate in a clear sky?

The bluish colour predominates in a clear sky.Why?

Explain why the bluish colour predominates in a clear sky.

Assertion : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Reason : Blue has the shortest wavelength among all colours.

Assertion : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Reason : Blue has the shortest wavelength among all colours.

(a) The blusih colour predominates in clear sky . (b) Voilet colour is seen at the bottom of the spectrum when white light is dispersed by a prism. State resons to explain these observations.