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Question: 

A micrometer is connected to the movable mirror of an interferometer. When the micrometer is tightened down on a thin metal foil, the net number of bright fringes that move, compared to closing the empty micrometer, is 296. What is the thickness of the foil? The wavelength of light used is 589 nm.

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

Quick Answer: 

$8.72 \times 10^{-5} \textrm{ m}$

Giancoli 7th Edition, Chapter 24, Problem 58

(0:57)

Chapter 24, Problem 58 is solved.

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