Answer
a. $2.21\times10^8m/s$.
b. $2.00\times10^8m/s$.
c. $1.97\times10^8m/s$.
Work Step by Step
Relate the index of refraction to the speed of light in the medium, using equation 23–4.
$$n=\frac{c}{v}$$
a. $v=\frac{c}{n}=\frac{3.00\times10^8m/s}{1.36}=2.21\times10^8m/s$.
b. $v=\frac{c}{n}=\frac{3.00\times10^8m/s}{1.50}=2.00\times10^8m/s$.
c. $v=\frac{c}{n}=\frac{3.00\times10^8m/s}{1.52}=1.97\times10^8m/s$.
