Update annex.fr.md

00.brainstorming-pedagogical-teams/45.synthesis-structuring/instructions-for-levels/30.beyond/annex.fr.md

@@ -170,23 +170,26 @@ Sont proposées les catégories suivantes, mais à débattre, toutes les idées
 ! <details markdown=1>
 ! <summary>
 ! What is the optical system giving the image of the painting?
-! <br><br>
 ! </summary>
+! <br>
 ! * The optical system is composed of two spherical refracting surfaces, centered on the same optical axis.
-! <br><br>
+! <br>
 ! </details>
 ! <details markdown=1>
 ! <summary>
 ! How do you characterize each of the single optical elements that make up this optical system, 
 ! and their relative distances?
 ! </summary>
+! <br>
 ! * The optical axis is oriented positively in the direction of light propagation 
 ! (from the painting towards the lensball).
+! <br>
 ! * The first spherical refracting surface $`DS1`$ encountered by the light has
 ! the follwing characteristics :<br>
 ! $`\overline{S_1C_1}=+|R|=+5\;cm`$ , $`n_{ini}=1`$ and $`n_{fin}=1.5`$
-! * The second spherical refracting surface $DS2$ encountered by the light 
-! has the follwing characteristics :<br>
+! <br>
+! * The second spherical refracting surface $DS2$ 
+! encountered by the light has the follwing characteristics :<br>
 ! $`\overline{S_2C_2}=-|R|=-5\;cm`$ , $`n_{ini}=1.5`$ and $`n_{fin}=1`$
 !
 ! * Algebraic distance between $DS1$ and $DS2$ is : $`\overline{S_1S_2}=+10\;cm`$