Update cheatsheet.en.md

5 years ago · aad1236e13
1 changed files with 4 additions and 0 deletions
--- a/12.temporary_ins/65.geometrical-optics/10.introduction/20.overview/cheatsheet.en.md
+++ b/12.temporary_ins/65.geometrical-optics/10.introduction/20.overview/cheatsheet.en.md
@ -6,6 +6,10 @@ routable: false
 visible: false
 ---

+## EN  CONSTRUCTION !
+
+-----
+
 ### The optics for everyday life

 ![](Opt_geom_1.jpg)