What is the speed of light in air ?

The speed of light in air is

What is the speed of light in a medium of refractive index 6/5 if its speed in air is 3,00,000 km/s?

The speed of light in air is:

The speed of light in air is-

Light enters from air to diamond with refractive index 2.42 What is the speed of light in diamond ? Given, speed light in air is 3xx10^8ms^(-1) .

Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass ? [The speed of light in vacuum is 3xx10^(8)ms^(-1) ].