2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/183731We present an alternative but intuitive method of obtaining the true or intrinsic quasar luminosity function through the observed one in the framework of gravitational lensing. Such a so-called inversion of the magnification bias can be straightforwardly performed by means of the Mellin transformation instead of other complex methods. Application of our approach to the well-known form of the observed quasar luminosity function identifies the previous results in literature.3 pages, no figure, A&A in pressAstrophysicstext