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Speed of light

I understand that light travel slower in glass as compared to air. Or is the speed of light a constant?
Question asked by: red white

Asked on: 19 Jul 2008

Yes light does travel slower through some mediums, hence the phenomena of refraction and defraction that occur.

The speed through a vacuum is constant and is the measured speed of light.

By: knowitall
Replied at: 24 Aug 2008
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