Those that attached traces have wrong traces or their traces do not have pin mark. Some candidates that attempted it had problems with their traces. (This question, based on refraction of light through a rectangular glass prism is not popular among the candidates. (ii) Calculate the critical angle for the glass prism used in the experiment above if (Attach your traces to your answer booklet.) Sate two precautions taken to ensure accurate results.Plot a graph with cos θ on the vertical axis and ф on the horizontal axis.Repeat the procedure for four other values of θ - 65o, 55o, 45o and 35o.Measure and record the values of MO and NO.Produce line P4P3 to meet the line DC at O.Remove the prism and the pins at P3 and P4 Draw a line to join P3 and P4.Fix two other pins at P 3 and P 4 such that they appear to be in a straight line with the images of the pins at P 1 and P 2 when viewed through the prism from side DC.Also draw a line RN to make an angle θ = 75o with AB at N Select a point N on AB such that AN is about one quarter of AB. Trace the outline ABCD of the rectangular glass prism on the drawing paper provided.Use the diagram above as a guide to carry out the following experiment.
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