Question
A thin film of oil $(n=1.50)$ is spread over a puddle of water $(n=1.33) .$ In a region where the film looks red from directly above $(\lambda=630 \mathrm{nm}),$ what is the minimum possible thickness of the film? (tutorial: thin film).
Step 1
The light ray that reflects off the top surface of the oil undergoes a 180-degree phase shift, while the light ray that reflects off the oil-water interface does not undergo a phase shift because oil is denser than water. Show more…
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A thin film of oil $(n=1.50)$ is spread over a puddle of water $(n=1.33) .$ In a region where the film looks red from directly above $(\lambda=630 \mathrm{nm}),$ what is the minimum possible thickness of the film?
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