# Laser, color and speed of light

by Mr.Ed
Tags: color, laser, light, speed
 P: n/a Anyone knows any good websites, books, resources for information about how the color of a laser might affect the velocity og the light wave projected by the laser ? Any help is appreciated.
 Sci Advisor P: 5,892 Please try to clarify what you are getting at. The speed of light does not depend on color.
P: 82
 Originally posted by mathman Please try to clarify what you are getting at. The speed of light does not depend on color.
It does if the light is not in a vacuum.

P: 402

## Laser, color and speed of light

 Originally posted by Dave It does if the light is not in a vacuum.
and has to do with the fact that the speed of EM waves is defined by the index of refraction for different materials.
 P: n/a well the instructor gave us this problem ( Im a college freshman, so they dont give us much information) " Laser, which use light rays of set wavelenghts(colors), are in constant use in our world. Determine whether the color of a laser affects the velocity of the light wave projected by the laser." maybe i phrase the question wrong, the first time, but this was all the information he gave us for this problem. Although a yes or no answer helps, im looking to understand the problem as in how, if they are, the light wavelenghts are affected. Any references, books, websites that could give me some information for this would help. Thanks for the quick replies and all help in advance.[:)]