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Question: 

A source produces first-order lines when incident normally on a 9800-slit/cm diffraction grating at angles $28.8 ^\circ$, $36.7 ^\circ$, $38.6 ^\circ$, and $41.2 ^\circ$. What are the wavelengths?

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

Quick Answer: 

$\lambda_1 = 490 \textrm{ nm}$ $\lambda_2 = 610 \textrm{ nm}$ $\lambda_3 = 640 \textrm{ nm}$ $\lambda_4 = 670 \textrm{ nm}$

Giancoli 7th Edition, Chapter 24, Problem 37

(1:28)

Chapter 24, Problem 37 is solved.

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