Why the sky looks blue? Prof Waqar Hussain

Why the sky looks blue?

PROF WAQAR HUSSAIN

         

Ans:- The sky known to us in nothing but air with billions of tiny dust particles floating in it. Its blue colour is got from the sun.

        The light from the sun is a mixture of violet, blue, green, yellow, orange and red rays. But we never see these colours separately except when they appear to us in a rainbow. The red-orange-yellow rays of light come straight down to earth from the sun. But the violet-blue-green rays behave 

differently as they are scattered by the tiny dust particles in the air. When we look up, the blue light rays are seen reflected by the dust particles. Thus, we see a blue sky.