Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 34 - Images - Problems: 17e

Answer

$i=-20cm$

Work Step by Step

Using the lens equation of $$\frac{1}{f}=\frac{1}{p}+\frac{1}{i}$$ solving for $i$ yields $$\frac{p}{pf}-\frac{f}{pf}=\frac{1}{i}$$ $$\frac{p-f}{pf}=\frac{1}{i}$$ $$i=\frac{pf}{p-f}$$ Substituting known values of$f=20cm$ and $p=10cm$ yields $$i=\frac{(10cm)(20cm)}{10cm-20cm}=-20cm$$
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