Short 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
A ray enters a rectangular glass slab obliquely and emerges from the other side. Explain why the emergent ray is parallel to the incident ray but shifted sideways.
Total: 3 marks
(a) State how the ray bends at the first surface. (1 mark)
(b) State how it bends at the second surface. (1 mark)
(c) Explain the final direction and lateral shift. (1 mark)
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