Question

what is the cause of formation of shadows

Answer 1

This happens because of Rayleigh scattering, the same property that causes the sky to appear blue. The opaque object is able to block the light of the sun, but not the ambient light of the sky which is blue as the atmosphere molecules scatter blue light more effectively. As a result, the shadow appears bluish.

Answer 2

This happens because of rayleigh scattering the same property the same property that causes the sky to appear blue. the opaque object is able to block the light of the sun but not the ambient light of the sky which is blue at the atmosphere molecule scatter blue light more effectively. as a result shadow appears bluish.

hope this helps you.