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Question: 

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?

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

Quick Answer: 

0.2 mm

Giancoli 7th Edition, Chapter 24, Problem 4

(3:59)

Chapter 24, Problem 4 is solved.

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Comments

distance is wrong

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 $0.62 \textrm{ mm}$, 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

its .62mm