refraction help?

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refraction help?

Physics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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any ideas about 2nd question. a start will be good.
the formula for radius of the sphere so that no light comes out is R=h/sqrt (mu^2 -1) this might help you.

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@Vincent-Lyon.Fr
what aspect of refraction do you not understand.?
|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!
got it. i was just doing a calculation mistake. thank you anyway.
ahh glad to help ;-)

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