GCSE level optics questions


The diagram shows the image IC formed by a lens, of an object OB a long way from it. The points F mark the focal points of the lens.

(a) Describe, either by writing below or drawing on the diagram, how the nature, size and position of the image changes:

(i) when the object OB is moved towards the focal point F.

(ii) when the object OB is moved past F to a point nearer the lens than the focal point.

(6 marks)

(b) Explain how a converging lens in a camera is used to produce sharp images on the film when the object is a long distance away from the camera, and when it is close to the camera.

(3 marks)

(Total 9 marks)