Physics · Oct / Nov 2025 · Paper 61 · Question 3
0625
As printed in the paper
The question as text
A student investigates the refraction of light in the material of a transparent block. Fig. 3.1 shows the ray-trace sheet. The student places a transparent block on the sheet and labels the block ABCD. A B D C eye P4 P3 Fig. 3.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[2]
Normal at 90°
2 cm (± 2 mm) from A
3(b)[2]
Incident ray at 30° ± 2° to left of normal
P1 P2 separation at least 5.0 cm
3(c)[2]
Single, neat line through P3 and P4 and continued to meet normal
r 32° ± 1°
3(d)(i)[1]
Third box only ticked
3(d)(ii)[2]
Two from:
1
Draw thin lines / use sharp pencil
2
Ensure pins are vertical / view bases of pins
3
Use thin pins
3(e)[2]
At least 3 extra values (all < 90°) given
Range to spread over at least 30°
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