2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178966The modifications induced in the standard weak-lensing formula if Newtonian gravity differs from inverse square law at large distances are studied. The possibility of putting bounds on the mass of gravitons from lensing data is explored. A bound on graviton mass, esitmated to be about 100 Mpc$^{-1}$ is obtained from analysis of some recent data on gravitational lensing.6 pages, 1 figure, added referencesHigh Energy Physics - Phenomenologytext