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Old Nov 4th 2009, 10:07 AM   #1
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[SOLVED] velocity of light in tube of water

a tube of water is travelling at c/2 relative to lab frame when a beam of light travelling in the same direction as the tube enters it. what is the speed of light in water relative to the lab frame?(refractive index of water=4/3)
well, i just came across this in physics today. wont it be c according to 2nd postulate?
but surprisingly the ans is 10/11c !
then i thought that refractive index is changing velocity of light- so it will be 3/4 c but still not the answer.
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Old Nov 5th 2009, 01:34 AM   #2
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The answer should be c/ refractive index as you have said.
The motion of the medium does not affect light which can propagate even in free space.
With sound however, the motion of the medium plays a role
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Old Nov 5th 2009, 07:12 AM   #3
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that is really very encouraging. i was thinking i had not understood relativity.
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