Name three kinds of mirrors. State the nature of images formed in them, when held close to the face.

Give two differences between real and virtual image.

State one use each of $\left(i\right)$ plane mirror $\left(ii\right)$ convex mirror $\left(iii\right)$ concave mirror.

What is a lens? What are its kinds?

How will you distinguish between a convex lens and a concave lens by feeling with your finger?

State the nature of image formed when a convex lens is held a few centimetres away from an object.

State the nature of image formed when a concave lens is held a few centimetres away from an object.

The image of the object formed by a lens is real, inverted and enlarged. What is the kind of lens?

When is a rainbow formed?