2023 XMS PRELIM P3 QP

2 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use Section A 1 In this experiment, you will investigate the refraction of light in a transparent block. You have been provided with  a transparent block marked with a spot,  a light source with a slit,  an A4 piece of card (Do NOT write on it),  a ruler,  a protractor. (a) Fig. 1.1 is on page 3 of your Question Paper. Turn on the light source to illuminate the slit. On Fig. 1.1:  position the illuminated slit at the top of the page so that a single ray of light is along the line LM. You may hold the A4 piece of card above the set-up to block some light from the surroundings in order to see the ray of light more clearly.  place the block inside the area marked ABCD with the short edges of the block parallel to LM.  adjust the position of the block so that the spot in the centre of the block is directly above point S on Fig. 1.1.  mark the point where the ray of light crosses the line XY; label this point W. [1] (b) Rotate the block slowly through approximately 30˚ about point S. Keep the spot in the centre of the block directly above point S. (i) Describe the relationship between the angle of rotation of the block and the displacement of light from point W. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (ii) Describe how the direction of rotation of the block affects the displacement of the ray of light along the line XY. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (c) Explain why (b) cannot be answered when the block is rotated through large angles approaching 90˚. …………………………………………………………………………………………… …………………………………………………………………………………………… [1]

3 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use Fig. 1.1

4 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use (d) A student claims that the displacement of the ray from point W is directly proportional to the angle of rotation of the block about point S. Plan an experiment to find out if the student’s claim is correct. In your plan, you should:  state the quantities that you will keep constant  describe in detail how you will perform the experiment  sketch the graph that you would obtain if the suggested relationship is correct. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ……………………………………