Gce Model Questions Vol1 2025 Physics Question 20
Practice objective / multiple choice question 20 from the 2025 Gce Model Questions Vol1 Physics examination.
A thin film of oil (refractive index \(n = 1.45\)) coats water (refractive index \(1.33\)). Light of wavelength \(600\ \text{nm}\) in vacuum is incident normally from air onto the oil film and the reflected light shows a bright fringe due to constructive interference. Determine the minimum non‑zero thickness of the oil film that will produce a dark fringe for light of wavelength \(500\ \text{nm}\) (also in vacuum) reflected from the same film. Assume a phase change of \(\pi\) occurs when light reflects from a medium of higher refractive index.
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About This Question
This is Gce Model Questions Vol1 2025 Physics Question 20. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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