Long 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
In a Young's double-slit experiment, and the fringe width is . A transparent sheet of thickness and refractive index is introduced in front of one slit. Find the optical path difference introduced, the fringe shift, and the direction of shift of the central fringe.
Total: 5 marks
(a) Find the optical path difference introduced by the sheet. (2 marks)
(b) Find the fringe shift on the screen. (2 marks)
(c) State the direction of shift of the central fringe. (1 mark)
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