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Question: 

Two (and only two) full spectral orders can be seen on either side of the central maximum when white light is sent through a diffraction grating. What is the maximum number of slits per cm for the grating?

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

Quick Answer: 

7140 slits/cm

Giancoli 7th Edition, Chapter 24, Problem 43

(2:16)

Chapter 24, Problem 43 is solved.

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