Answer
The f-number is $~~5$
Work Step by Step
Note that f-number is $\frac{f}{D}$
We can find the f-number:
$\frac{f}{D} = \frac{35~mm}{7.0~mm} = 5$
The f-number is $~~5$
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: 7
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