Answer
$1.82$
Work Step by Step
The required ratio can be determined as
$\frac{v_w}{v_d}=\frac{c/n_w}{c/n_d}$
$\implies\frac{v_w}{v_d}=\frac{n_d}{n_w} $
We plug in the known values to obtain:
$\frac{v_w}{v_d}=\frac{2.42}{1.33}=1.82$
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 941: 51
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