Answer
$I_1 = 3~mW/m^2$
Work Step by Step
We can find the light intensity when one slit is covered:
$I_{max} = 4~I_1$
$I_1 = \frac{I_{max}}{4}$
$I_1 = \frac{12~mW/m^2}{4}$
$I_1 = 3~mW/m^2$
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 - Exercises and Problems - Page 650: 35
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