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 - Page 1038: 8

Answer

$i = 28~cm$

Work Step by Step

When $p = 20~cm$, we can see that $i$ is undefined. We can find $r$: $\frac{1}{p}+\frac{1}{i} = \frac{2}{r}$ $\frac{1}{i} = \frac{2}{r}-\frac{1}{p} = 0$ $\frac{2}{r} = \frac{1}{p}$ $\frac{2}{r} = \frac{1}{20~cm}$ $r = 40~cm$ We can find $i$ when $p = 70~cm$: $\frac{1}{p}+\frac{1}{i} = \frac{2}{r}$ $\frac{1}{i} = \frac{2}{r}-\frac{1}{p}$ $\frac{1}{i} = \frac{2}{40~cm}-\frac{1}{70~cm}$ $\frac{1}{i} = \frac{1}{28~cm}$ $i = 28~cm$
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