Update topic.en.md

5 years ago · 939f3fa138
1 changed files with 2 additions and 0 deletions
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/topic.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/topic.en.md
@ -1,4 +1,6 @@
 ---
 title: 'Use the basic optical elements'
+published: true
+visible: false
 ---