Answer the following questions:
Take a large shining metal spoon. Bring the deeper(i.e., concave) surface closer to your face. Can you see your image?
Now take the spoon away from your face. What change do you observe in the image?
Now repeat the activity by turning the convex surface of the spoon to the front.
What changes do you notice in the image?

Answer the following questions: When an object is moved from the centre of curvature of a concave mirror towards its focus, what change do you observe in the size of the image?

Answer the following questions : Take two similar pages from your notebook. Crumple one paper and allow this and the other paper to fall on the ground simultaneously. What do you observe ?

Answer the following questions: place a clock near the end of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. what do you observe?

Take a small stone. Hold it in your hand. What are the forces acting on the stone ? Now release the stone. What do you observe ? What are the forces acting on the stone after you release it ?

Take a small stone . Hold it in your hand. What are the forces acting on the stone? Now release the stone . What do you observe? What are the forces acting on the stone after you release it ?

Answer the following questions:Make two sufficiently long, identical tubes out of a cardboard. Arrange them on a table, in front of a wall as shown in figure . Place a clock near the end of one of the tubes and try to hear the ticking of the clock at the end of the other tube by placing your ear there. Adjust the angles of the two tubes till you can hear the sound very clearly Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way. In the experiment, what will happen if you lift one of the tubes to some height?

Take a piece of thin aluminium sheet and dip it in water in a bucket . What do you observe ? Now shape the same piece of aluminium into a small boat and place it on the surface of water . It floats , isn't it ?

Answer the following questions : An object is placed in front of a convex lens of focal length 20 cm. If the object distance is changed from 60 cm to 40 cm , what can you say about the size of the image relative to that of the object?