Update cheatsheet.fr.md

01.curriculum/01.physics-chemistry-biology/03.Niv3/03.wave-optics/01.wave-optics-general/01.wave-optics-validity/01.wave-optics-domain-of-validity-overview/cheatsheet.fr.md

@@ -3,4 +3,6 @@ Title :
 published : false
 visible : false
 ---
-bref hosrorique
+bref historique
+
+![](historic-wave-optics_fr_L1200.jpg)