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. what did you observe?

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?

Answer the following questions : Observe the following figure and answer the questions : Which optical instrument shows arrangement of lenses as shown in the figure ?

Answer the following questions : At which position will you keep an object in front of a convex lens to get a real image smaller than the object ? Draw a figure.

Answer the following questions : Take two coils of about 50 turns. Insert them over a nonconducting cylindrical roll as shown in fig. A thick paper roll can be used . Connect coil 1 to a battery with a plug key k. Connect coil 2 to a galvanometer G. plug the key and observe the deflection in the galvanometer. Unplug the key and again observe the deflection. Note ( your observations. What conclusions do you draw from these observations?

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 question: Two conductors A and B are mounted on insulated stands and connected by a conducting wire as shown in figure. What is the direction of current when the electric potential of A is (1) higher than that of B(2) lower than that of B?

Answer the following questions : Observe the figure and answer the following questions. Identify the machine shown in the figure.

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?

Answer the following questions: What happens when you shake a wet piece of cloth? Explain your observation.

Answer the following questions : In which type of microscope do you find the lens arrangement as shown in the following diagram ?