Reflecting periscope is used by the barbers to show the back of head.

Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through 90^(@) . Name one instrument in which such a prism is used.

What do you mean by reflection of sound ? State one condition for the reflecton of a sound wave. Name a device in which reflection of sound wave is used.

What is a total reflecting prism ? State three actions that it can produce. Draw a diagram to show one such action of the total reflecting prism.

The point p(3,4) undergoes a reflection in the X-axis followed by a reflection in the y-axis. Show that their combined effect is the same as the single reflection of p(3,4) in the orign.

A certain coin is tossed with probability of showing head being 'p' . Let 'q' denotes the probability that when the coin is tossed four times the number of heads obtained is even. Then

Using Huygen's construction, draw a figure showing the propagation of a plane wave reflecting at the interface of the two media. Show that the angle of incidene is equal to the angle of reflection.

Using Huygen's construction, draw a figure showing the propagation of a plane wave reflecting at the interface of the two media. Show that the angle of incidence is equal to the angle of reflection.

In the above problem, if some of the sound reaching the target ges reflected back to the rocket as an echo, then what frequency of the echo is detected by the rocket?

Fig. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic material nearby. Insert two magnetic field lines on either side of the magnet using arrow head to show the direction of each field line.