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 student observes diffraction due to a thin slit. The slit width is then reduced while the same light and screen distance are kept fixed.
Total: 3 marks
(a) What happens to the width of the central maximum? (1 mark)
(b) Why should the same light source be used while comparing the two observations? (1 mark)
(c) State one practical condition needed to observe a clear diffraction pattern. (1 mark)
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