Question

If the refractive index from air to water, nw = 1.3 and the velocity of light in the air is

3 x 108 m/s, what is the velocity of light in water?

Answer 1

`n _(w) = (c)/(v) \\ 1.3 = \frac{3 * {10}^(8) }{v} \\ v = \frac{3 * {10}^(8) }{1.3} \\ v = 2 * {10}^(8) \: m {s}^( - 1)`