  We present the first results of a project aiming to derive the physical
properties of high-redshift lensed galaxies, intrinsically fainter than the
Lyman break galaxies currently observed in the field. From FORS and ISAAC
spectroscopy on the VLT, we use the full rest-frame UV-to-optical range to
derive the physical properties (SFR, extinction, chemical abundances, dynamics,
mass, etc) of low-luminosity z ~ 2 star-forming galaxies. Although the sample
is still too small for statistical studies, these results give an insight into
the nature and evolutionary status of distant star-forming objects and their
link with present-day galaxies. Such a project will serve as a basis for the
scientific analysis of the EMIR/GOYA survey on the GTC.
