diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/05.refracting-telescope/02.new-course-overview/cheatsheet.fr.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/05.refracting-telescope/02.new-course-overview/cheatsheet.fr.md
index 0618fca13..c9ec37c25 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/05.refracting-telescope/02.new-course-overview/cheatsheet.fr.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/05.refracting-telescope/02.new-course-overview/cheatsheet.fr.md
@@ -10,3 +10,12 @@ visible : true
 !!!! Ceci n'est qu'un document de *première étape d'un travail collaboratif*.<br>
 !!!! Page non répertorié.
 
+principe
+https://www.geogebra.org/m/kact2epr
+
+grossissement
+https://www.geogebra.org/m/ajmh4crf
+
+cercle oculaire
+https://www.geogebra.org/m/skjnfmyk
+