Friday, November 30, 2007

it's never too early...

... to put up the tree:



Yup, I put it right in front of me to remind me that as Christmas gets nearer, exams are going to be over!

"Hyugen's principle states that every point on a wave front will behave as a secondary point source emitting spherical wavelets with the same speed as the original wave in the forward direction only."

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