why light rays deviate away from the normal when it passes from a denser to a rarer medium .

Asked by Sushant Kumar | 26th Dec, 2013, 08:59: PM

Expert Answer:

This is due to the least time principle, which says that "Of all the possible paths that light might take to get from one point to another, it always takes the path that requires the least amount of time."

Answered by  | 26th Dec, 2013, 09:55: PM

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