eng Science and Education Publishing International Journal of Physics 2333-4576 2023-07-10 11 3 153 157 10.12691/ijp-11-3-4 IJP20231134 article Fulvio Andres Callegari fulvio.callegari@ufabc.edu.br 1 Centro de Engenharia, Modelagem, e Ci¨ºncias Sociais Aplicadas, Universidade Federal do ABC, Santo Andr¨¦, SP, Brasil. Avenida dos Estados, 5001 - Bairro Santa Terezinha Santo Andr¨¦ - CEP: 09210-580 It is presented a code using a free software in order to calculate optical parameters for an arbitrary system consisting in N thick lenses submerged in optical media with arbitrary refraction index. This code calculates focus, front and back focal distances, principal planes and image distances for such multi-lens systems. The software was verified by solving numeric examples extracted from well-established optics literature. http://pubs.sciepub.com/ijp/11/3/4/ijp-11-3-4.pdf Matrix Optics Open-Source Algorism Multi-lenses System Thick Lenses Back Focal length Front Focal Length Principal Planes Focus