From 383e95a174c38d8da342d1aefa4c0529d785f3be Mon Sep 17 00:00:00 2001
From: Claude Meny <claude.meny@irap.omp.eu>
Date: Sat, 20 Mar 2021 09:17:46 +0100
Subject: [PATCH] Delete cheatsheet.en.md

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 delete mode 100644 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/03.reflexion-refraction-raytracing/04.reflexion-refraction-overview/02.reflexion-refraction-overview/cheatsheet.en.md

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----
-title: 'The 5 laws of geometrical optics'
-media_order: 'interaction_lumiere_surface_3.gif,Opt_Geo_refle_lim.gif,Loi_reflexion.png,Opt_Geo_loi_refrac.jpg'
----
-
-###The 5 laws of light rays optics
-
-**Fermat's principle $\Longrightarrow$ 5 las of light rays optics**
-
-
-##### Propagation of light is rectilinear
-
-In an homogenous and isotropice medium for its optical properties, light rays propagate in straight lines.
-
-##### Light rays do not interact with each other
-
-
-##### Law of reflection
-
-<!--Comment for a fursther step :
-Rays are geometrical constructions that indicate the direction of flow of the luminous energy
-- in an homogenous medium, rays are stright lines.
-- in an isotropic medium, rays
--->
-
-* The **reflected ray** *belongs to the incidente plane*, and is*located in the opposite side to that of the incident ray*, with regard to the normal of the surface at the impact point. **The angle of reflection $r$ is equal to the angle of incidence $i_1$ :
-
-$r=i_1$**
-
-![](Loi_reflexion.png)
-
-##### Law of refraction
-
-![](Opt_Geo_loi_refrac.jpg)
-
-[](https://www.geogebra.org/material/iframe/id/bg5ewxee)
-
-
-