Answer
$\lambda \lt a$
Work Step by Step
We can write an equation for single slit interference:
$sin~\theta = \frac{n~\lambda}{a}$
For the first minimum, $sin~\theta = \frac{\lambda}{a},$ which requires that $\lambda \lt a$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0321740904
ISBN 13:
978-0-32174-090-8
Chapter 22 - Wave Optics - Conceptual Questions - Page 648: 5
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