Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
24
The Wave Nature of Light
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24-3: Double-Slit Interference
24-4: Visible Spectrum; Dispersion
24-5: Single-Slit Diffraction
24-6 and 24-7: Diffraction Gratings
24-8: Thin-Film Interference
24-9: Michelson Interferometer
24-10: Polarization

Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 4
Q

If 720-nm and 660-nm light passes through two slits 0.62 mm apart, how far apart are the second-order fringes for these two wavelengths on a screen 1.0 m away?

A
0.2 mm
Giancoli 7th Edition, Chapter 24, Problem 4 solution video poster
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COMMENTS
By jiwook.kim on Sat, 2/20/2016 - 7:57 AM

distance is wrong

By Mr. Dychko on Sun, 2/21/2016 - 5:01 AM

Hi jiwook.kim, thanks for the comment. At 2:58 in the video I noticed the error in the separation between slits that you pointed out and changed it to 0.62 mm0.62 \textrm{ mm}, and the correct value was used in the later calculations so the final answer is still correct. Thanks for mentioning this anyways since if there was a mistake then it would be important to let other students know.

All the best,
Mr. Dychko

By jiwook.kim on Sat, 2/20/2016 - 7:57 AM

its .62mm

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