Answer
$0.24 \% \mathrm{~nm}$.
Work Step by Step
Similarly for $m=3$, we have $\theta=68^{\circ}$, and the corresponding value of dispersion is $0.24 \% \mathrm{~nm}$.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 36 - Diffraction - Problems - Page 1113: 57e
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