Physics · Oct / Nov 2025 · Paper 62 · Question 1
0625
As printed in the paper
The question as text
A student investigates the reflection of light by a plane mirror. The student’s ray-trace is shown full-size in Fig. 1.1. L N M 1 P R 2 Fig. 1.1
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
1(a)[1]
normal correct (by eye), extended to cross PR and Q labelled
1(b)[2]
θ = 10° ± 1° and end of line labelled O
MO = 14.0 ± 0.2 cm
1(c)(i)[1]
line joining M to the crosses, continued to cross PR
1(c)(ii)[1]
a = 1.7 ± 0.1 cm
b = 10.3 ± 0.1 cm
1(d)[2]
r correct
answer to 2 significant figures
1(e)[2]
statement to match results (expect YES)
values from table used to justify statement
1(f)[1]
extend the investigation for different values of θ
1(g)[1]
reflecting surface of the mirror is at the back/thickness of mirror/small variations in protractor angle have a much larger effect on a and b/ thickness of light ray/difficult to locate centre of light ray/experiment not done in a dark room
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