diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/03.wave-optics/01.wave-optics-general/01.wave-optics-validity/.gitkeep b/01.curriculum/01.physics-chemistry-biology/03.Niv3/03.wave-optics/01.wave-optics-general/01.wave-optics-validity/.gitkeep
deleted file mode 100644
index e69de29bb..000000000
diff --git a/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/.gitkeep b/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/.gitkeep
deleted file mode 100644
index e69de29bb..000000000
diff --git a/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 b/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
deleted file mode 100644
index 12ce296f6..000000000
--- a/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
+++ /dev/null
@@ -1,8 +0,0 @@
----
-Title : 
-published : false
-visible : false
----
-bref historique
-
-![](historic-wave-optics_fr_L1200.jpg)
\ No newline at end of file
diff --git a/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/historic-wave-optics_en_L1200.jpg b/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/historic-wave-optics_en_L1200.jpg
deleted file mode 100644
index 067f093cc..000000000
Binary files a/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/historic-wave-optics_en_L1200.jpg and /dev/null differ
diff --git a/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/historic-wave-optics_es_L1200.jpg b/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/historic-wave-optics_es_L1200.jpg
deleted file mode 100644
index f912ddd3e..000000000
Binary files a/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/historic-wave-optics_es_L1200.jpg and /dev/null differ
diff --git a/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/historic-wave-optics_fr_L1200.jpg b/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/historic-wave-optics_fr_L1200.jpg
deleted file mode 100644
index fff541a0c..000000000
Binary files a/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/historic-wave-optics_fr_L1200.jpg and /dev/null differ