Short answer·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 point object is in front of a convex spherical glass surface of radius . Light travels from air into glass of refractive index . Find the image distance from the surface using the Cartesian convention.
Total: 3 marks
(a) Find the image distance and state whether the image is real or virtual. (3 marks)
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