Answer
1.62
Work Step by Step
Find the index of refraction using equation 23–4.
$$n=\frac{c}{v}=\frac{c}{0.82v_{water}}$$
$$=\frac{c}{0.82c/n_{water}}=\frac{ n_{water}}{0.82}$$
$$=\frac{1.33}{0.82}=1.62$$
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