Can someone explain in lay terms how the research done by Lene Hau about Light speed reduction is actually possible? Isn't the speed of light a constant?
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$\begingroup$ The question I've linked above specifically references the work of Hau's group. $\endgroup$ – John Rennie Oct 19 '16 at 19:27
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Speed of light in a vacuum is constant but the speed of light going through different medias is not constant. The speed of light in other medias is very dependent on the index of refraction.
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