Question

The speed of light in air is 300, 000 km/s. What is the speed of light in glass if the refractive index of glass is 1.5

Answer 1

Answer

the speed of light in glass is given by

$v=\frac{c}{n}=\frac{3\times10^{8}}{1.5}=2\times10^{8}$ m/s