Question

birds flying in the sky do not cast their shadow on the earth.Explain with a reason (short reason )

Answer 1

Shadow is an effect caused due to obstacle of sunlight giving rise to no light area . Birds are flying high above the ground, the shadow is however light falling on birds isn't well obstructed because of small size and a shadow doesn't exist because of other light particles filling the shadow area more over they are too far from earth while flying hence they don't cast a shadow

Answer 2

We do not see the shadow of a kite or a bird flying high up in air because in their shadow the umbra is absent and the penumbra is too large too faint i.e. it is not visible as thebdistance of screen (i.e. earth) is very large from the object (i.e. kite or bird)