diff --git a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/03.optical-systems-vergence/02.optical-systems-vergence-overview/cheatsheet.en.md b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/03.optical-systems-vergence/02.optical-systems-vergence-overview/cheatsheet.en.md
index b9ac33163..5fa887c6d 100644
--- a/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/03.optical-systems-vergence/02.optical-systems-vergence-overview/cheatsheet.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/03.optical-systems-vergence/02.optical-systems-vergence-overview/cheatsheet.en.md
@@ -414,7 +414,7 @@ Fig. 16. In this experiment, the observed object is located at a certain distanc
 **$\Longrightarrow$** *imager action* characterized by the **longitudinal magnification $M_L$**<br><br>
 **$M_L=\dfrac{image\:size}{object\:size}=\dfrac{\overline{A'_1A_2'}}{\overline{A_1A_2}}$**
 
-
+End