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Question: 

A diffraction grating has $6.5 \times 10^5 \textrm{ slits/m}$. Find the angular spread in the second-order spectrum between red light of wavelength $7.0 \times 10^{-7} \textrm{ m}$ and blue light of wavelength $4.5 \times 10^{-7} \textrm{ m}$.

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

Quick Answer: 

$30^\circ$

Giancoli 7th Edition, Chapter 24, Problem 39

(1:50)

Chapter 24, Problem 39 is solved.

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