Update...

Update 10.temporary-m3p2/16.waves/20.n2/10.concept-of-wave-and-wave-phenomena-2/20.overview/cheatsheet.fr.md

10.temporary-m3p2/16.waves/20.n2/10.concept-of-wave-and-wave-phenomena-2/20.overview/cheatsheet.fr.md

@@ -12,6 +12,10 @@ lessons:
         slug: mechanical-and-optical-waves-2-fr
         name: PARALLÈLE-2 : Ondes mécaniques et optiques
         order: 1
+    -
+        slug: wave-optics-and-representation-of-aptical-waves-2-fr
+        name: PARALLÈLE-2 : Vers l'onde électromagnétique
+        order: 1
 ---
 
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