DP Physics (last assessment 2024)

Question 20N.3.SL.TZ0.b

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

[Maximum mark: 2]

20N.3.SL.TZ0.b

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.

Lens A has a focal length of $4.00 cm$ . An object is placed $4.50 cm$ to the left of A. Show by calculation that a screen should be placed about $0.4 m$ from A to display a focused image.

[2]

Markscheme

$\frac{1}{v} = \frac{1}{4.00} - \frac{1}{4.50}$ ✓

$v = 36.0 « cm »$ ✓

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.b

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