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Question: 

How many slits per centimeter does a grating have if the third order occurs at a $15.0 ^\circ$ angle for 620-nm light?

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

Quick Answer: 

1400 lines/cm

Giancoli 7th Edition, Chapter 24, Problem 36

(1:17)

Chapter 24, Problem 36 is solved.

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