Long answer·Hard exam skill (4/5)·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
Compare the practical methods for finding focal length of a concave mirror and a convex lens using a distant object.
Total: 6 marks
(a) State the common principle used in both methods. (2 marks)
(b) State one difference in the arrangement. (2 marks)
(c) Give two precautions common to both methods. (2 marks)
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