Physics · May / June 2023 · Paper 62 · 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 shows her ray-trace sheet. P3 P Q A B eye P4 Fig. 3.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)(i)[1]
normal at 90° and in the centre of AB
3(a)(ii)[1]
P1 and P2 must be ⩾ 5.0 cm apart
i = 20 ± 2
3(a)(iii)[1]
P1 and P2 must be ⩾ 5.0 cm apart
3(b)(i)[1]
line joining pin positions continued to AB and either end of line labelled E
3(b)(ii)[2]
θ = 32 ± 2
unit °
3(c)[1]
any one from:
view bases of pinsplace pins as far apart as possible / > 5 cm apartensure pins are vertical / at right angles to ray-trace sheetdraw thin linesuse a sharp penciluse thin pins3(d)(i)[1]
α = 69 ± 2(°)
3(d)(ii)[1]
β = 90 – α
3(e)[2]
statement to match results – expect YES
explanation of idea of beyond limits of experimental accuracy
e.g. values close (enough) / not too far apart / < 10% difference
if values are equal, it is sufficient to say just that the values are equal
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