no.
speed of light is always constant .
as long as the light stays in the same medium.
the speed is generally slightly different in different media.
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No.
Refractive Index= Speed of Light in Vaccum / Speed of Light in the material
The speed changes.
That is the speed of light.That is the speed of light.That is the speed of light.That is the speed of light.
The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.