diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/03.wave-optics/01.wave-optics-general/01.wave-optics-validity/02.wave-optics-validity-overview/.gitkeep b/01.curriculum/01.physics-chemistry-biology/03.niv3/03.wave-optics/01.wave-optics-general/01.wave-optics-validity/02.wave-optics-validity-overview/.gitkeep deleted file mode 100644 index e69de29bb..000000000