# GCSE level optics questions

Q7.

(a) The diagram shows how parallel rays of light pass through a convex lens.

(i) Mark the position of the focus.

(1 mark)

(ii) Is this a converging lens, a diverging lens, both or neither?

(1 mark)

(b) The diagram shows how parallel rays of light pass through a concave lens.

(i) Mark the position of the focus.

(1 mark)

(ii) Is this a converging lens, a diverging lens, both or neither?

(1 mark)

(c) Complete these sentences by choosing the correct word or phrase from the brackets.

In a camera, a (converging/diverging/parallel) lens is used to produce an image of an object on a (film/lens/screen). The image is (larger than/smaller than/the same size as) the object. The image is (nearer to/further from/the same distance from) the lens, compared to the distance of the object from the lens.

(4 marks)

(d) In a cinema projector, a convex lens is used to produce a magnified, real image.

(i) What does magnified mean?

(1 mark)

(ii) What is a real image?

(1 mark)

(e) You are in a dark room. You have a box containing some lenses. Only one of them is a converging lens. Describe how, by just feeling the lenses, you can pick out the converging lens.

(2 marks)

(Total 12 marks)