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Question: 

White light containing wavelengths from 410 nm to 750 nm falls on a grating with 7800 slits/cm. How wide is the first-order spectrum on a screen 3.40 m away?

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: 

1.3 m

Giancoli 7th Edition, Chapter 24, Problem 38

(2:46)

Chapter 24, Problem 38 is solved.

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