Answer
$D = 3.0~mm$
Work Step by Step
Note that f-number is $\frac{f}{D}$
We can find the aperture diameter $D$:
$f-number = \frac{f}{D}$
$D = \frac{f}{f-number}$
$D = \frac{12~mm}{4.0}$
$D = 3.0~mm$
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)
by Knight, Randall D.
Published by
Pearson
ISBN 10:
0133942651
ISBN 13:
978-0-13394-265-1
Chapter 35 - Optical Instruments - Exercises and Problems - Page 1017: 8
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