Physics · Oct / Nov 2020 · Paper 62 · Question 2
0625
As printed in the paper
The question as text
A student investigates the refraction of light in a transparent block. Fig. 2.1 shows her ray-trace sheet. She places a transparent block on the ray-trace sheet and draws the outline ABCD of the block. The student uses pins to mark the positions of objects and images. eye C P3 P4 B D A Fig. 2.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[1]
normal in centre of AB to 2 mm and at 90°
and F and G correctly labelled
2(b)[1]
P1P2 pin separation at least 5.0 cm
2(c)(i)[1]
line through P3 and P4 correctly drawn and its end
labelled K
2(c)(ii)[1]
points H and J correctly labelled, and FH correctly drawn
2(c)(iii)[1]
a = 1.3 ± 0.1 cm and b = 4.2 ± 0.1 cm
2(d)[2]
candidate’s θ correct to ± 2(°)
unit
2(e)[1]
any one from:
thin lines / pins / sharp pencil
view bases of pins
ensure pins vertical / perpendicular to ray trace sheet
use large pin separation
(securely) attach the ray trace sheet to the surface
2(f)[1]
maximum range 27(°) – 33(°)
2(g)[2]
repeat experiment using more i values
uses at least 4 i values
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