Why does light slow down in water?

Why does light slow down in water?

Creator: Fermilab
There are many mysteries of physics for which you can find explanations online and some of those explanations are wrong. In this video, Fermilab’s Dr. Don Lincoln takes on the mystery of why light travels slower in water and glass. He lists a few wrong explanations and then shows you the real reason this happens.
Added: 20 Feb 2019
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