diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.en.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.en.md
index f1cc9f73c..207de3a7b 100644
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/01.new-course-main/textbook.en.md
@@ -1,5 +1,7 @@
 ---
 title: 'new course : main'
+published: false
+visible: false
 ---
 
 ### A lens