Question

Make your classroom dark by closing the doors and windows. Ask one of your friends to hold a mirror in his hand. Take a torch and cover its glass with a black paper leaving only slit in the middle. Now switch on the torch and adjust it so that light falls on the mirror in your friend’s hand. Ask your friend to adjust the mirror so that the patch of light falls on another friend standing in front of him at some distance.

i) What do you observe from the above activity?

ii) Ask your friend A to cover the mirror with a book. Now switch on the torch and focus it on the book, Can you see the patch of light on your friend? Why?

iii) Did the light that fell on the book not get reflected?

Answer 1

i) When light falls on any object, it rebounds back. This is called reflection.

ii) When mirror is covered with book I can’t found patch of light on my friend. Because the surface of book is not smooth as mirror. On smooth surfaces reflection is effective.

iii) The light fell on the book is reflected. But its irregular reflection. Because the book surface is not smooth as mirror.