True or False?
When light travels from an optically rarer to denser medium the speed of light reduces.
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How are we expected to answer a factual question like this one is? Do we reexplain it to the readers with a better approach than the one we get ourselves, or copy paste related articles or their links, or give a simple analogy just like the way we tell things to little kids under 6? I would say that the ray of light is much like a sports car, which can go as fast as the advertised speed as long as it have the circuit / highways all to itself (light in the vacuum), but you put one on a jammed busy road, it will get stuck, even blocked, depending on the differing densities of the mediums.