ACS Exp Prelim 2024 P3_final

This document consists of 11 printed pages PRELIMINARY EXAMINATION 2024 YEAR 4 EXPRESS PHYSICS 6091 / 03 Tuesday 30 July 2024 1 hour 50 minutes READ THESE INSTRUCTIONS FIRST Write your index number and name on all the work you hand in. Write in dark blue or black pen. You may use an 2B pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions. All of your answers should be written in this Question Paper: scrap paper must not be used. Graph paper is provided in this Question Paper. Additional sheets of graph paper should be used only if it is necessary to do so. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiments is not required. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Index Number Name For Examiner’s use 1 2 3 Total

Y4Exp Physics Preliminary Examination 2024 Page 2 of 11 Section A 1 In this experiment, you will deduce the path taken by a light ray undergoing total internal reflection in a glass block. You are provided with: • A4 Plain Paper • Cork mat • Five optical pins • Rectangular glass block • Protractor • 30.0 cm ruler • Set square Fig. 1.1 (not to scale) (a) Place the largest surface of the block in the middle of the sheet of plain paper. Draw around the block to mark its position. Remove the glass block and label the corners ABCD as shown in Fig. 1.1. Draw a normal at point M, 1.0 cm from the corner point B of the block, as shown in Fig. 1.1. Use the protractor to construct an incident ray at an angle of incidence i of 30o. Replace the block and place the plain paper on the cork mat. Place the two object pins P1 and P2 along the incident ray. Position your eyes to look through the side CD of the glass block. You should observe 2 reflected images of P1 and P2 appear at side BD when looking through the side CD. 1.0 cm

Y4Exp Physics Preliminary Examination 2024 Page 3 of 11 Place two further pins P3 and P4 in line with the reflected images of P1 and P2 so that, when viewed through the block, the four pins appear to be one behind the other. Remove the block and draw a line joining P4 and P3 to the edge of the block and mark the point of intersection as point N. This line is the emergent ray. Measure and record the distances BD and ND from your trace using the ruler. BD = ......................................................... [1] ND = ......................................................... [1] (b) (i) Calculate the v