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If space time in a vacuum is directly linked to the speed of light c. (big IF).Then using only length : ΔL/ΔT=c. The ratio of distance (length) to time is a constant.In water the refractive index is 1.3, so light is 30% slower.So then ΔL2/ΔT2=c/1.3; which gives us a different ratio for space time.When a diver runs his clock his time does not change relative to time on the surface.The distances appear greater, but this is an optical illusion only. So why does space time not change under water? Or is refraction really a change in space time?
sē = Δrē - cēΔtē