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Question: 

Light of wavelength 680 nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 38 mm from the central fringe on a screen 2.8 m away. What is the separation of the two slits?

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

Quick Answer: 

$1.5 \times 10^{-4} \textrm{ m}$

Giancoli 7th Edition, Chapter 24, Problem 7

(2:80)

Chapter 24, Problem 7 is solved.

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