Answer the following questions:
Adjust the angles of the two tubes till you can hear the sound very clearly. Measure the angle of incidence `theta1` and the angle of reflection `theta2`. Give your opinion

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 question : Can a triangle have two obtuse angles? Why?

Measure the angle of incidence theta_1 and the angle of reflection theta_2 . Try to see if they are related in any way.

Answer the following : State the difference between angle of incidence and angle of reflection .

Answer the following question form the diagram: Which two angles are equal?

Answer the following questions Define angle of incidence and angle of refraction.

Answer the following : Describe an experiment to prove that the angle of incidence is equal to the angle of reflection .

Answer the following questions Explain the terms total internal reflection and critical angle.

Answer the following questions: Sometimes reflections of sound may be undesirable. Can you give some example?

Answer the following questions:Find the equations of the straight lines through(3,2) which make acute angle of 45^@ with the line x-2y-3=0