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Question: 

A lens appears greenish yellow ($\lambda$ = 570 nm is strongest) when white light reflects from it. What minimum thickness of coating (n = 1.25) do you think is used on such a glass lens (n = 1.52), and why?

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

Quick Answer: 

230 nm. With yellow-green reflected, more red and blue will be transmitted.

Giancoli 7th Edition, Chapter 24, Problem 47

(2:29)

Chapter 24, Problem 47 is solved.

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