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Question: 

Monochromatic light falls on a slit that is $2.60 \times 10^{-3} \textrm{ mm}$ wide. If the angle between the first dark fringes on either side of the central maximum is $28.0 ^\circ$ (dark fringe to dark fringe), what is the wavelength of the light used?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

629 nm

Giancoli 7th Edition, Chapter 24, Problem 22

(1:40)

Chapter 24, Problem 22 is solved.

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