diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/02.paraxial-optics-simple-elements/02-spherical-refracting-surface/.gitkeep b/02.spherical-refracting-surface/.gitkeep
similarity index 100%
rename from 01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/02.paraxial-optics-simple-elements/02-spherical-refracting-surface/.gitkeep
rename to 02.spherical-refracting-surface/.gitkeep