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Question: 

A uniform thin film of alcohol (n = 1.36) lies on a flat glass plate (n = 1.56). When monochromatic light, whose wavelength can be changed, is incident normally, the reflected light is a minimum for $\lambda = 525 \textrm{ nm}$ and a maximum for $\lambda = 655 \textrm{ nm}$. What is the minimum thickness of the film?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

482 nm

Giancoli 7th Edition, Chapter 24, Problem 55

(4:13)

Chapter 24, Problem 55 is solved.

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