Question

why sky looks like sky blue

Answer 1

Hi friend,

A phenomenon called Rayleigh's Scattering causes light to scatter when it passes through particles that have a diameter one-tenth that of the wavelength (colour) of light. Sunlight is made up of different colours, but because of the elements in the atmosphere, the colour blue is scattered more efficiently than other colours making the sky appear blue. However, the moon does not have an atmosphere, so light is not scattered, and the sky appears black.

Hope this helps you.......
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Answer 2

The color of sky is due to the property of dispersion of light 

the white light of the colour before reaching the earths surface gets dispersed into its 7 components VIBGYOR 

the molecules present in the atmosphere are capable of scattering only the light with shortest wavelength and hence red light wont get scattered

As the light that we get from sun is white in color and due to atmospheric refraction splitting up of white light takes place and the light with longest wavelength gets lost in the space and blue and violet has shortest wavelength but the intensity of blue will be much more than that of violet which makes us see the sky blue in colour