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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Top Q&A For: Why does light travel slower in some media than...

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

Light has no charge at all. It consists only of electric and magnetic field, each endlessly recreating the other as the pair zip off through empty space at the speed of light.The fact that light wa... Read More »
http://www.howeverythingworks.org/page1.php?QNum=1546

Why does the signal light not come on, on my virgin media modem?

Yep = you go find your Virgin paperwork and locate the 'help' (phone number) and call them up ..
http://uk.answers.yahoo.com/question/index?qid=20130306100011AA2BEFv

How Does Light Travel Through a Glass Prism?

To learn how light travels through a glass prism, you first need to know the function of the glass prism. When light travels through air, it travels very quickly. A glass prism is much denser than ... Read More »
http://www.ehow.co.uk/how-does_4913773_light-travel-through-glass-prism.html

Does light have mass If so, then how can it travel at the speed of light Doesn't the mass of an object (particle) approach infinity as its velocity approaches the speed of light?

Light has precisely zero mass and that makes all the difference. You're right that taking a massive particle up to the speed of light is impossible because doing so would, in a certain sense, give ... Read More »
http://www.howeverythingworks.org/page1.php?QNum=524


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