Draw a diagram to show how a converging lens focusses parallel rays of light.

Object is placed at the following distances from a convex lens of focal length 16 cm:

(a) 35 cm (b) 32 cm

(c) 20 cm (d) 10 cm

Which position of the object will produce?

(I) a magnified real image?

(ii) A magnified virtual image?

(iii) A diminished real image?

(iv) An image of same size as the object?

When an object is placed at a distance of 40 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of?

(a) 10 cm from the lens?

(b) 20 cm from the lens?

How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light?

Write the formula for a lens connecting image distance (), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?