Case study·Standard multi-step (3/5)·No calculator
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
A school laboratory has a compound microscope whose objective gives a linear magnification of and whose eyepiece acts as a simple microscope of magnifying power .
Total: 5 marks
(a) Find the total magnifying power. (1 mark)
(b) If a different eyepiece of magnifying power 10 is used with the same objective, find the new total magnifying power. (2 marks)
(c) State why the objective focal length is chosen small in a compound microscope. (2 marks)
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