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It is a well-known fact that light rays do not follow the null geodesics ofthe space-time in nonlinear electrodynamics; instead, they follow the nullgeodesics of the so-called effective space-time. Taking this into account, inthis paper, we aim to discuss the possibility of distinguishing the type ofcharge with which the black hole is endowed, via the motion of light rays. Theresults show that, for any black hole being a charged solution of the fieldequations of general relativity coupled to the nonlinear electrodynamics, onecannot distinguish the two types of charge (magnetic or electric) through themotion of light rays around it.

Can a light ray distinguish charge of a black hole in nonlinear electrodynamics?