When can a photon escape a black hole?

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Offline jeffreyH

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When can a photon escape a black hole?
« on: 19/12/2014 23:12:42 »
How near to the event horizon is too near for a photon so that it becomes trapped? Is one Planck length far enough away for the photon to escape? What about half a Planck length? How would we calculate this?