Answer
$\approx2.1cm$
Work Step by Step
From ex 25, we have apparent depth $d^{'}=\frac{d}{n}$
where d is the actual depth.
If the refractive index of the glass plate is roughly 1.66 ,
then the apparent depth $=\frac{3.5}{1.66}=2.1 cm$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 22 - Reflection and Refraction of Light - Learning Path Questions and Exercises - Exercises - Page 775: 36
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