%0 Journal Article %A VilasPrieto, José Luis %A Sánchez Brea, Luis Miguel %A Bernabeu Martínez, Eusebio %T Optimal achromatic wave retarders using two birefringent wave plates: reply %D 2013 %@ 1559-128X %U https://hdl.handle.net/20.500.14352/33594 %X This reply attempts to cast some more light on the achromatic systems composed by wave plates, in particular to the calculus of the overall retardation and the use of the Jones matrix equivalence theorem. An equivalent expression for the overall retardation of the system in terms of the trace is also given %~