In the sunshine, your shadow travels everywhere with you. Sometimes it bends in funny places. And sometimes it bends into a strange shape. But as long as the sun shines, your shadow is always there. On a very cloudy day, or in a dark room, you have no shadow at all. Where does your shadow go? What is your shadow?
We have shadows because light moves in a certain way. It moves in waves, something like ripples in water. As long as nothing is in the way, the light waves move in one direction. But when the light waves hit an object, they are stopped. Then, on the other side of the object that stopped the light waves, there is a dark space – a shadow.
Objects in a dark room have no shadows because there are no light waves travelling through the room. On cloudy days, shadows are harder to see because the clouds break up the light waves from the sun. The clouds soak up some of the light waves and scatter the rest of the light waves in all directions. When the light waves scatter and bounce instead of moving in one direction, no shadows are formed.
Picture Credit : Google