diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/02.plane-refracting-surface-overview/cheatsheet.en.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/02.plane-refracting-surface-overview/cheatsheet.en.md
index 0da3fde94..d729e13d2 100644
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/02.plane-refracting-surface-overview/cheatsheet.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/01.plane-refracting-surface/02.plane-refracting-surface-overview/cheatsheet.en.md
@@ -212,30 +212,30 @@ in Figures 3 and 4, and 5 and 6 below, and review NOTE 1.
* with real objects
-[](thin-spherical-surface-1.png)
+
Fig. 4.
-[](thin-spherical-surface-2.png)
+
Fig. 5.
-[](thin-spherical-surface-3.png)
+
Fig. 6.
-[](thin-spherical-surface-4.png)
+
Fig. 7.
* with virtual objects
-[](thin-spherical-surface-5.png)
+
Fig. 8.
-[](thin-spherical-surface-6.png)
+
Fig. 9.
-[](thin-spherical-surface-7.png)
+
Fig. 10.
-[](thin-spherical-surface-8.png)
+
Fig. 11.