---
title: 'Plane refracting surface (previous level)'
---

course : level-1 
- or level+1 if current level = 1
- or level-2  if current level = 4

#####for parallel or other level course :
It will be possible to redirect towards an other page in the m3p2 cursus.
Or to write here some paragraphes separated by html from an other pages, I think.
Or write here a completely new parallel course

For the moment, please wait.