diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/topic.en.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/topic.en.md
index 6e6227d3e..3fb9c3412 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/topic.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/topic.en.md
@@ -1,5 +1,7 @@
 ---
 title: 'function and characterization of optical instruments'
+published: false
+visible: false
 ---
 
 réénoncer des conditions. Déjà fait dans chapitre précédent ?