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Question 18M.3.SL.TZ1.b

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.3.SL.TZ1.b
Level SL Paper 3 Time zone TZ1
Command term Determine Question number b Adapted from N/A
b.
[Maximum mark: 3]
18M.3.SL.TZ1.b

A converging (convex) lens forms an image of an object on a screen.

A system consisting of a converging lens of focal length F1 (lens 1) and a diverging lens (lens 2) are used to obtain the image of an object as shown on the scaled diagram. The focal length of lens 1 (F1) is 30 cm.

Determine, using the ray diagram, the focal length of the diverging lens.

[3]

Markscheme

any 2 correct rays to find image from lens 1

ray to locate F2

focal length = «–»70 «cm»

M18/4/PHYSI/SP3/ENG/TZ1/08.b/M

 

Accept values in the range: 65 cm to 75 cm.

Accept correct MP3 from accepted range also if working is incorrect or unclear, award [1].

[3 marks]

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