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EXERCISES LIGHT

PAPER 1

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PAPER 2

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PAPER 2 SECTION B [20 marks] 1. Diagram 9.1 and diagram 9.2 show the light rays from two identical objects passing through the

convex lenses, J and K. Both the lenses produce virtual images. F is the focal point for each lens.

(a) (i) What is meant by virtual image? [1 mark]

(ii) With reference to Diagram 9.1 and diagram 9.2, compare the thickness of the lenses, the focal length and the size of image produced by the lenses J and K. Relate the size of the image with the focal length to make a deduction regarding the relationship between the power of the lens and the focal length.

[5 marks]

(b) Explain why a piece of paper burns when placed under a convex lens aimed towards hot sun rays.

[4 marks]

(c) You are given two convex lenses, P and Q, with focal lengths 40 cm and 5 cm respectively. Both the lenses are used to build a simple astronomical telescope at normal adjustment. (i) Using the two lenses, explain how you are going to build the simple astronomical

telescope. [6 marks]

(ii) Suggest modifications that need to be done on the telescope to produced clearer and bigger images.

[4 marks]

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PAPER 3-SECTION A (12 marks)

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