The index of refraction of water is 1.33. What would be the speed of a light wave passing through at this medium?

Question

4 x 10^8 m/s
2.3 x 10^8 m/s
4.4 x 10^-9 m/s
2.6 x 10-^9 m/s

Answer 1

Refractive Index = (Speed of light in vacuum)/(Speed of light in medium)

Speed of light in vacuum = 3 x 10^8 m/s
Refractive Index = 1.33

1.33 = (3 x 10^8)/(x)

Solve for x.