diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/02.paraxial-optics-simple-elements/03.lens/01.lens-main/.gitkeep b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/05.paraxial-optics/02.paraxial-optics-simple-elements/03.lens/01.lens-main/.gitkeep
deleted file mode 100644
index e69de29bb..000000000