Question

 Why does light travel slower in some media than in a vacuum For example, in glass or other transparent media, visible light is not absorbed and yet it slows down. What's going on — FH, Waltham, MA?

Answer When a light wave enters matter, the light wave's electric field causes charged particles in the matter to accelerate back and forth. That's because an electric field exerts forces on charged parti... Read More »
http://www.howeverythingworks.org/page1.php?QNum=1083


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How can light "travel" through a vacuum when there were no "particles" in the vacuum on which it could "transmit" its charge — DC?

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http://www.howeverythingworks.org/page1.php?QNum=1546


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