Gurmit wanted to perform Activity 13.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teacher's advice?

Explain how you can take care of your eyes.

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. 13.19. Draw the reflected ray from the second mirror.