DP Physics (last assessment 2024)

Question 17N.3.SL.TZ0.b

Date	November 2017	Marks available	[Maximum mark: 2]	Reference code	17N.3.SL.TZ0.b
Level	SL	Paper	3	Time zone	TZ0
Command term	Determine	Question number	b	Adapted from	N/A

[Maximum mark: 2]

17N.3.SL.TZ0.b

An astronomical reflecting telescope is being used to observe the night sky.

The diagram shows an incomplete reflecting telescope.

When the Earth-Moon distance is 363 300 km, the Moon is observed using the telescope. The mean radius of the Moon is 1737 km. Determine the focal length of the mirror used in this telescope when the diameter of the Moon’s image formed by the main mirror is 1.20 cm.

[2]

Markscheme

$\frac{{2 \times 1737}}{{363300}} = \frac{{0.0120}}{f}$

f = 1.25 «m»

Allow ECF if factor of 2 omitted answer is 2.5m

Syllabus sections

Option C: Imaging

Option C: Imaging » Option C: Imaging (Core topics) » C.2 – Imaging instrumentation

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

Question 17N.3.SL.TZ0.b

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