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Question: 

How far must the mirror $M_1$ in a Michelson interferometer be moved if 680 fringes of 589-nm light are to pass by a reference line?

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

Quick Answer: 

0.20 mm

Giancoli 7th Edition, Chapter 24, Problem 56

(2:52)

Chapter 24, Problem 56 is solved.

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