Physics · Oct / Nov 2020 · Paper 61 · Question 3
0625
As printed in the paper
The question as text
A student investigates the magnification of the image produced by a lens. Fig. 3.1 shows the apparatus used. illuminated object u v lens screen bench Fig. 3.1 Fig. 3.2 shows a triangular hole in a card that forms the illuminated object. Fig. 3.2 is drawn actual size. illuminated object hO Fig. 3.2
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3(a)[1]
h0 = 1.5 cm OR 15 mm
3(b)[1]
m values 3.55, 1.66, 1.08, 0.80, 0.64
3(c)[4]
Graph:
Axes correctly labelled and right way round
Suitable scales
All plots correct to ½ small square
Good line judgement, thin, continuous line
3(d)[2]
Method clearly shown on graph
u1 correct to ½ small square
3(e)[1]
f values from 13.5 to 16.4 cm
3(f)[2]
Any two from:
Use dark room / bright object
Move screen slowly to find best image
Mark centre of lens position on lens holder
Place metre rule on bench / clamp rule in position
Ensure object, lens and screen are vertical
Ensure object and lens at same height from bench
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