diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/05.plane-refracting-surface-parallel-2/form.en.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/05.plane-refracting-surface-parallel-2/form.en.md
index 692bdb96d..be0a5c02c 100644
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/05.plane-refracting-surface-parallel-2/form.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/05.plane-refracting-surface-parallel-2/form.en.md
@@ -1,5 +1,7 @@
 ---
 title: 'Thin lens (parallel 2)'
+published: false
+visible: false
 ---
 
 new course : parallel 2