suite

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

@@ -212,7 +212,7 @@ in Figures 3 and 4, and 5 and 6 below, and review NOTE 1.
 
 * with real objects
 
-[](thin-spherical-surface-1)<br>
+[](thin-spherical-surface-1.png)<br>
 Fig. 4.
 
 [](thin-spherical-surface-2)<br>