What is the speed of light in a medium of refractive index 1.4 if its speed in air is 3, 00,000 km/s?

The speed of light in vacuum and in two different glasses is given in the table below:

(a) Calculate the absolute refractive indexes of flint glass and crown glass.

(b) Calculate the relative refractive index for light going from crown glass to flint glass.

The speed of light in air is 3 x 10⁸ m/s. In medium X its speed is 2 x 10⁸ m/s and in medium Y the speed of light is 2.5 x 108 m/s. Calculate:

(a) airⁿx = ?

(b) airⁿy = ?

(c) aⁿy

The refractive index of glass is 1.7. Calculate the speed of light in glass. The speed of light in air is 3.0 x 10⁸ ms^-1

The speed of light in water is 2.25 x 10⁸ m/s. If the speed of light in vacuum be 3 x 10⁸ m/s, calculate the refractive index of water.