Laws of reflection of sound:

(1)The direction in which the sound is incident and reflected, make equal angles with the normal to the reflecting surface.

(2) The direction in which the sound is incident, the direction in which sound is reflected and the normal to the reflecting surface, all lie in the same plane.

Activity: Take a drawing board and fix it in the vertical position on the table. Put two metallic cardboard tubes A and B. These tubes make some angle with each other. Put a clock near one end of the tube A and a solid screen between the two tubes, so that the sound of the clock may not be heard directly by the ear placed in front of the second tube.

The sound waves after reflecting from the drawing board enter the second tube and are heard by the ear placed in front of the second tube. Go on adjusting the position of the second tube B, till the loudness of the sound heard through the second tube becomes maximum. At this stage, the incident angle which is the law of reflection.