Sánchez Soto, Luis LorenzoMonzón Serrano, Juan JoséLeuchs, Gerd2023-06-222023-06-222022-12-011084-752910.1364/JOSAA.472160https://hdl.handle.net/20.500.14352/72946© 2022 Optica Publishing Group. Financial support from the Spanish Ministerio de Ciencia e Innovación (Grant PGC2018-099183-B-I00) is gratefully acknowledgedWe address the response of a Fabry-Perot interferometer to a monochromatic point source. We calculate the anti -caustics (that is, the virtual wavefronts of null path difference) resulting from the successive internal reflections occurring in the system. They turn out to be a family of ellipsoids (or hyperboloids) of revolution, which allows us to reinterpret the operation of the Fabry-Perot interferometer from a geometrical point of view that facilitates comparison with other apparently disparate arrangements, such as Young's double slit.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttp://dx.doi.org/10.1364/JOSAA.472160https://opg.optica.orgopen access535Wave-FrontsÓptica (Física)2209.19 Óptica Física