Question

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

Answer 1

We can see the shadow of the football lying on the ground because the ground acts as a screen for it.
If we take the object away and away from the screen, the shadow becomes smaller and smaller in size and a time comes when it totally disappears from the screen.
When the football is kicked high, the ground, which is acting as a screen is far away from the football, hence no shadow will be formed on the ground.