Physics · May / June 2023 · Paper 61 · Question 3
0625
As printed in the paper
The question as text
A student investigates the refraction of light using a semicircular transparent block. Fig. 3.1 and Fig. 3.2 show his ray-trace sheet. eye P Q B A P4 P3 Fig. 3.1
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Show the answer and mark scheme
3(a)[1]
normal at 90° and in centre of AB
3(b)(i)[1]
CD is in lower left quadrant and i = 30°± 2°
3(b)(ii)[1]
P1 and P2 at least 5.0 cm apart
3(c)(i)[1]
straight line through pins P3 and P4 to AB
3(c)(ii)[2]
all three lines LN, CD and CE drawn and meet or would meet at C within approx. 2 mm (by eye), drawn neatly and not too thick
α in range 47(°) − 51(°)
3(d)[1]
any one from:
view bases of pinsplace pins (as) far apart (as possible)ensure pins are verticalsharp pencil / thin lines / thin pins3(e)(i)[1]
β in range 70(°) −73(°)
3(e)(ii)[2]
correct answer for θ (which is 90 − β)
correct working shown (90 − β)
3(f)[1]
statement to match results with justification including the concept of within or beyond the limits of experimental accuracy
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