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existenz2 said:

I lost it at the speed of light is a constant when it you can see it bends in water.. if it bends it must slow down on the inside of the curve..!

Individual photons don't travel at less than the-speed-of-light. It's constant everywhere. Fact.

But considering the whole material, light waves and the information they carry appear to travel at the slower speed in water etc.

The mathematics is extremely well backed up. This is one of science's strongest facts you're attacking.