Methods developed for radio occultation studies of planetary atmospheres are used to predict the electromagnetic focusing properties of a refracting lens representation of a Schwarzschild black hole. The infinity of foci are of three distinct types: a principal forward axial focus which is by far the strongest; higher-order forward axial foci; and backward conical foci with axial nulls.
On the black hole lens and its foci
Advances in Space Research ; 9 , 9, 19
1989-01-01
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On the black hole lens and its foci
Elsevier | 1989
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