Absolute refractive index of glass varies for green and red colour light. Why?

Absolute refractive index of vaccum is

Define absolute refractive index.

Refractive index of glass is maximum for the colour of white light

Does the refractive index of glass depend on the colour of light? If so, how?

Can absolute refractive index of a medium exceed unity?

Absolute refractive index of water and glass are (4)/(3) and (3)/(2) . What is the ratio of velocity of light in glass and water?

Refractive index of glass is 1.5. What is the velocity of light in glass?

Green light of wavelength 5640 in incident on an airglass interface. If the refractive index of glass is 1.5 what will be the wavelength of light in glass?