Update cheatsheet.en.md

01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/02.mirror/02.new-course-overview/cheatsheet.en.md

@@ -149,13 +149,13 @@ side* of the mirror.<br><br>
 * with **real objects** 
 
 ![](Thin-spherical-mirror-InfAC-1000.jpg)
-Concave mirror with object between infinity and C
+Fig. 5.  Concave mirror with object between infinity and C
 
 ![](Thin-spherical-mirror-CAF-1000.jpg)
 Fig. 6.  Concave mirror with object between C and F/F’
 
 ![](Thin-spherical-mirror-FAS-1000.jpg)
-Fig. 5.  Concave mirror with object between F/F’ and S
+Fig. 7.  Concave mirror with object between F/F’ and S
 
 ![](Thin-spherical-mirror-InfAS-1000.jpg)
 Fig. 8.  Convex mirror