What is the ratio of velocity of red colour light to velocity of violet colour of light in vacuum ?

Write the ratio of velocity of red and violet radiations.

The value of velocity of light in vacuum is:

The refractive index of the material of a prism for yellow colour is 1.5. What would be the velocity of yellow colour through the prism? Velocity of light in vacuum is 3* 10^8 m/s.

What is the ratio of velocity of light of wavelengths 4000 oversetcircA and 8000 oversetcircA in vacuum?

The ratio between the velocity of light in a given optical medium to the velocity of light in vacuum is called refractive index.

Correct the following sentences, if required changing the underlined portion. The velocity of red light is more than that for violet light in a transparent medium.