good answers by everyone, but i don't think that they answer the HOW part of it because refractive index itself is defined in terms of velocity so ou can't say that velocity is increasing because refractive index is decreasing. the velocity of light depends on electric and magnetic properties of matter and velocity increases because of change in these properties
Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi
Moderation Team
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