2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10059Arclets in clusters of galaxies can be used to determine the lens mapping and not only to constrain the mass density of the cluster. Multiply imaged arclets are therefore easily identified without further modelling.4 pages latex, 2 figures, uuencoded, compressed tar-fileAstrophysicstext