Case study·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
A camera lens of focal length is initially focused on a very distant object, so the sensor is behind the lens. The camera is then focused on an object in front of the lens.
Total: 5 marks
(a) Find the new lens-to-sensor distance. (2 marks)
(b) Find the shift of the sensor from the infinity-focus position. (1 mark)
(c) Find the magnification. (2 marks)
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