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Old 18-05-2011, 04:14 PM
adman (Adam)
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Join Date: Sep 2009
Location: Brisbane
Posts: 1,279
its more about the transition from one medium to the other. One analogy that can be useful is driving a car from hard tarmac onto sand at an angle. One wheel hits the sand first and is slowed down, so the car pulls to that side, then when all the wheels are on the sand it continues straight...

does that make any sense? It helps to imagine the light as a wavefront, rather than as a particle.
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