Long answer·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
In a liquid refractive-index practical using a convex lens and plane mirror, a student obtains no parallax at a different needle position after placing liquid between the lens and mirror.
Total: 4 marks
(a) What does the no-parallax position represent? (1 mark)
(b) Why does adding the liquid change the position? (1 mark)
(c) State two precautions for reliable observation. (2 marks)
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