Ask your friend to stand at a certain distance from you in a big room and obtain the shadow of your friend on the wall with the help of a torch. Now carry out the following actions. Observe and make a note of the changes taking place in the shadows.
Go toward the left and then to the right of the friend.

Explanation

When we go to the left side of our friend, the shadow falls on his right side. When we shift on the right side,his shadow goes on the left side.