DP Physics (last assessment 2024)

Question 20N.3.SL.TZ0.11d

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.3.SL.TZ0.11d
Level	SL	Paper	3	Time zone	TZ0
Command term	Calculate	Question number	d	Adapted from	N/A

[Maximum mark: 2]

20N.3.SL.TZ0.11d

A beam of monochromatic light from infinity is incident on a converging lens A. The diagram shows three wavefronts of the light and the focal point $f$ of the lens.

(d)

Calculate the total magnification of the object by the lens combination.

[2]

Markscheme

« $m = - \frac{i}{o} = \frac{- 36}{4.5}$ for A or $\frac{- 8}{- 1.6}$ for B»

$m_{A} = « - » 8$ OR $m_{B} = « + » 5$ ✓

total magnification $= « - » 40$ ✓

Allow [2] marks for a bald correct answer

Allow ECF from (b) and (c).

Eg if $u = 2.7 c m$ in (c) then $m_{B} = 3$ and total $m = 24$

Syllabus sections

Option C: Imaging

Option C: Imaging » Option C: Imaging (Core topics) » C.1 – Introduction to imaging

Option C: Imaging » Option C: Imaging (Core topics)

Question 20N.3.SL.TZ0.11d

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