Image formed by a plane mirror is

1. virtual, behind the mirror and enlarged.
2. virtual, behind the mirror and of the same size as the object.
3. real at the surface of the mirror and enlarged.
4. real, behind the mirror and of the same size as the object.

Describe the construction of a kaleidoscope.

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.