diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/topic.en.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/topic.en.md
index 3459933bd..94fc7be79 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/topic.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/topic.en.md
@@ -1,6 +1,7 @@
 ---
 title: 'Physical systems versus optical systems '
-published: false
+published: true
+routable: true
 visible: false
 ---