A lens of focal length 20 cm is used to produce a ten times magnified image of a film slide on a screen. How far must the slide be placed from the lens ?

A convex lens of focal length 6 cm is held 4 cm from a newspaper which has print 0.5 cm high. By calculation, determine the size and nature of the image produced.

Determine how far an object must be placed in front of a converging lens of focal length 15 cm in order to produce an erect (upright) image of linear magnification 4.

An object placed 4 cm in front of a converging lens produces a real image 12 cm from the lens.

(a) What is the magnification of the image?

(b) What is the focal length of the lens?

(c) Draw a ray diagram to show the formation of

Image. Mark clearly F and 2F in the diagram.

An object 2 cm tall stands on the principal axis of a converging lens of focal length 8 cm. Find the position, nature and size of the image formed if the object is:

(i) 12 cm from the lens

(ii) 6 cm from the lens