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yrelhan4Best ResponseYou've already chosen the best response.0
any ideas about 2nd question. a start will be good.
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.0
the formula for radius of the sphere so that no light comes out is R=h/sqrt (mu^2 1) this might help you.
 one year ago

yana175Best ResponseYou've already chosen the best response.0
what aspect of refraction do you not understand.?
 one year ago

MashyBest ResponseYou've already chosen the best response.1
dw:1361076183674:dw the condition for the source to be JUST seen is that... so find for what radius is that condition satisfied.. once you have what the final radius is... then you can find the time taken to get to that radius!
 one year ago

yrelhan4Best ResponseYou've already chosen the best response.0
got it. i was just doing a calculation mistake. thank you anyway.
 one year ago
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