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