Physics · May / June 2022 · Paper 41 · Question 7
0625
As printed in the paper
The question as text
Fig. 7.1 is a full-scale diagram of a small nail N in front of a thin converging lens. The line L represents the lens. L N 1.0 cm 1.0 cm Fig. 7.1 (full scale) The focal length of the lens is 3.0 cm.
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7(a)[3]
(all the light) meets (at a point) or is focused or intersects
(all the light) travels towards a point
C1 it then diverges or spreads out (from that point) or point of convergence is on XY / at F / the focal point / principal focus / 3.0 cm from lens
7(b)[1]
two marked points on XY 3.0 cm from centre of lens and one on left and one on right and each labelled F
7(c)(i)[3]
two of these rays from tip of N drawn:
ray (that seems to come) from left-hand principal focus and emerges from lens paraxially
paraxial ray to lens and then towards right-hand principal focus
ray towards / through centre of lens
two rays traced back to intersection
and line from intersection to axis and line labelled I
7(c)(ii)[1]
virtual and light / rays do not pass through I or
virtual and light / rays only seem to come from I or
virtual and produced by diverging rays
virtual and (real) rays do not meet
7(c)(iii)[1]
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