In general LTB dust collapse the photon surface is a null hypersurface generated by outgoing radial null geodesics that reaches the central singularity if and only if the singularity is naked.
Joshi.Gravitational Collapse and Spacetime Singularities
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Photon surfaces extension in general spherical dust collapse
In general LTB dust collapse the photon surface is a null hypersurface generated by outgoing radial null geodesics that reaches the central singularity if and only if the singularity is naked.