Answer
$1.28\times10^{8}ms^{-1}$
Work Step by Step
Index of refraction (n) = Speed of light in vacuum (c)$\div$ Speed of light in the stone (v).
⇒v= $\frac{c}{n}=\frac{3.00\times10^{8}m/s}{2.35}\approx1.28\times10^{8}ms^{-1}$
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 774: 10
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