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 shines the same laser beam through water, glass and diamond. The measured speeds are highest in water and lowest in diamond.
Total: 4 marks
(a) Which medium has the greatest refractive index? (1 mark)
(b) Explain using the relation between speed and refractive index. (2 marks)
(c) If light enters diamond from air obliquely, will it bend towards or away from the normal? (1 mark)
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