GCSE level optics questions


The diagram shows a converging lens of focal length 4 cm being used as a magnifying glass. An object 1.6 cm tall is placed 2.4 cm from the lens.

(a) On the diagram, use a ruler to construct accurately the position and size of the image. You should show how you construct your ray diagram and how light appears to come from the image to the eye.

(4 marks)

(b) The image is virtual. What is a virtual image?

(1 mark)

(c) Calculate the magnification produced by the lens. Show clearly how you work out your answer.

(2 marks)

(Total 7 marks)