Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 27 - Optical Instruments - Problems and Conceptual Exercises - Page 973: 93

Answer

(a) $9.7cm$ (b) increase

Work Step by Step

(a) We know that $D=\frac{1}{3}(26.4)=38.cm$ Now we can find the focal length as $f=(1.1)(8.8)=9.7cm$ (b) Since we know that the f-number is inversely proportional to the aperture diameter, the f-number increases if the pupil is narrowed.
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