Update page.en.md

56ceb520 · Claude Meny · 24418b66 · 56ceb520
Commit 56ceb520 authored Sep 08, 2020 by Claude Meny
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--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/06.plane-refracting-surface-level-down/page.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/06.plane-refracting-surface-level-down/page.en.md
 ---
 title: 'Plane refracting surface (previous level)'
+published: false
+visible: false
 ---
 course : level-1