My textbook explains the cause of the refraction of light as the "difference between the speeds of light when passing from medium 1 to medium 2". The same textbook explains that the cause of the differing speeds of light in different mediums as "the result of of interference between the incident light and the radiated( and delayed) light of the same frequency and a shorter wavelength".
My questions are:
- Is this explanation of the refraction of light fundamentally flawed in some way?
- If the speed of light when passing through a medium is the result of the shortening of its wavelength, why doesn't the color of a refracted ray of light change?