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I know that nothing travels faster than light in a vacuum, but if light is not in a vacuum, can it be overtaken by something that is travelling faster than the modified speed, while still preserving the speed of light in a vacuum?Hope that makes sense.
Interesting, lightarrow. The way I read the OP question (and the wording was tricky, as the OP suggested), the answer is yes, and distimpson's post is close to the ideal answer. That is, your particle in water IS satisfying the OP request.