Answer
$\phi=3.1^{\circ}$ counterclockwise.
Work Step by Step
For $m=3$ the above equation gives $\theta=48.1^{\circ}$. The crystal should be turned $\phi=48.1^{\circ}-45^{\circ}=3.1^{\circ}$ counterclockwise.
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: 71c
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