Piquero Sanz, Gemma MaríaSerna Galán, Julio2023-06-202023-06-202002-090143-080710.1088/0143-0807/23/5/302https://hdl.handle.net/20.500.14352/58815© 2002 IOP Publishing Ltd.In a stratified graded-index medium the variation of the refractive index can be measured directly from the analysis of light paths. Only Snell's law and a simple set-up based on digitized images and a personal computer are needed.engjournal articlehttp://dx.doi.org/10.1088/0143-0807/23/5/302http://iopscience.iop.org/open access535OpticsQuantum Optics. LasersÓptica (Física)2209.19 Óptica Física