Question $1(4$ points$)$

What is the speed of light in glass $(n=1\mathrm{.}5)?$

${3\mathrm{.}0}^{\text{'}}{10}^8\frac{m}{s}$

${4\mathrm{.}5}^{\text{'}}{10}^8\frac{m}{s}$

$2*{10}^8\frac{m}{s}$

${0\mathrm{.}5}^{\text{'}}{10}^8\frac{m}{s}$