Why does light slow down in a medium such as crystal?

If light does slow down depending on the medium it travels through, how slow can it be slowed down?





I don't mean stopped completely as hitting a lead wall, but going through a transparent medium.





Can it be slowed down enough for machine to detect it's wave or particle?

Why does light slow down in a medium such as crystal?
when the light passes through a medium its two componets i.e EM field due to the resistance and reluctance of the medium begin to reduce not in strength but in speed of creation .......... this slows down the lights speed





practically its due to interaction of the photon of light by the atoms as it is absorbed and again radiated ............





however due to its large speed the speed cannot be slowed down very much ... to be detected if it's wave or particle
Reply:Most likely when two particle of light are touching their speed would be in the vicinity of close to zero. Other wise how could lightparticle become locked in the electron after atomic absorption? The electron does not move at the speed of light. Report It


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