---
title: 'nouveau cours : principal'
---

nouveau cours : principal

#### Classification des lentilles

A simple lens is a volume made with a transparent substance of refractive index $n$, that present a symetry of revolution around an axis called the optical axis of the lens. This volume is bound by two polished surfaces that can be both curved, or one curved and the other plane. The curved surfaces which have to 

We limit 

