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“When light passes through different mediums speed changes but who provide acceleration to change velocity?”
This question was posted by Jishnu
Answer: Just imagine you are participating in a cross country race. When the road is good you can travel faster; but if the path is a marshy place, your speed will decrease. This is just an analogy. To understand it better, you should know that the way light travels in a medium is different from the way it travels in vacuum.
