Long answer·Hard exam skill (4/5)·Calculator allowed
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
An astronomical telescope has objective focal length and eyepiece focal length . Find its magnifying power and tube length in normal adjustment. Then find the magnifying power when final image is formed at the near point .
Total: 5 marks
(a) Find magnifying power in normal adjustment. (1 mark)
(b) Find tube length in normal adjustment. (1 mark)
(c) Find magnifying power for final image at the near point. (3 marks)
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