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Question: 

A thin oil slick $(n_o = 1.50)$ floats on water $(n_w = 1.33)$. When a beam of white light strikes this film at normal incidence from air, the only enhanced reflected colors are red (650 nm) and violet (390 nm). From this information, deduce the (minimum) thickness $t$ of the oil slick.

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

Quick Answer: 

325 nm

Giancoli 7th Edition, Chapter 24, Problem 54

(5:80)

Chapter 24, Problem 54 is solved.

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