Question

The refractive index of water is 1.5 calculate the velocity of light in water

Answer 1

By definition of Refractive Index :

$1.5 = \frac{ c_{v}}{ v_{m} }$

$= > v_{m} = \frac{c_{v} }{1.5} = (2\times {10}^{8} )m {s}^{ - 1}$

Where 'c' is the Velocity of Light in Vaccum