With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.

Give the position, size and nature of image formed by a concave lens when the object is placed:

(a) Anywhere between optical center and infinity.

(b) At infinity.

Which type of lens is?

(a) A converging lens, and which is

(b) A diverging lens? Explain your answer with diagrams.

How would a pencil look like if you saw it through?

(a) A concave lens, and

(b) A convex lens? (Assume the pencil is close to the lens). Is the image real or virtual?

An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is (i) converging, and (ii) diverging.