Answer
$2.8cm$
Work Step by Step
As $d_i=-md_{\circ}$
$\implies d_i=-(2.0)(1.4)=-2.8cm$
We know that
$f=(\frac{1}{-2.8}+\frac{1}{1.4})^{-1}$
$f=2.8cm$
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 26 - Geometrical Optics - Problems and Conceptual Exercises - Page 943: 87
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