Question

Light enters from air to glass having refractive index $1.50$ what is the speed of light in the glass? The speed of light in vacum is:

Answer 1

Refractive Index = Speed of light in vacuum/speed of light in the medium
$1.5=3\times {10}^8$/speed of light in glass
Speed of light in glass
$=\frac{(3\times {10}^8)}{1.5}$
$=2\times {10}^{8}m/s$