Update portal.en.md

d1071404 · Claude Meny · f7e98cd7 · d1071404
Commit d1071404 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/07.plane-refracting-surface-level-up/portal.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/07.plane-refracting-surface-level-up/portal.en.md
 ---
 title: 'Refraction matrix (next level)'
+published: false
+visible: false
 hero_classes: ''
 hero_image: ''
 ---