1) The human eye has a converging lens system that produces an image at the back of the eye. If the eye views a distant object, which type of image is produced?

2) The diagram below shows object O, the image I formed from the light passing through lens L.

Which distance is the object distance?

3) We can see things in the world because there is a converging lens system in our eyes.

Which of the following describe(s) the nature of the image formed in our eye when we are looking at a distant object?

(1) real

(2) upright

(3) diminished

4) When an object is placed 11 cm from the optical centre of a lens, the image formed is real, inverted and enlarged but when the object is 9 cm from the optical centre of the lens, the image formed is virtual, upright and enlarged. What is a possible focal length of the lens?

5) A simple projector uses a convex lens L to form a sharp, inverted and magnified image of an object O on a screen at S.

If the screen is moved slightly further away from the lens to S' how should the lens be moved to form a sharp image on the screen at S'?