tangential_quip t1_je9o8ge wrote
Reply to comment by lmjoe in ELI5: Why can black holes cause light to not escape, but light doesn't slow down from gravity(and only change direction)? by [deleted]
The speed of light does change depending on the medium it is passing through. For example, it is slower in water than through a vacuum and slower through glass than it is in water.
That, however, isn't relevant to the question being asked by OP.
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