diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/OG_intro.mp3 b/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/OG_intro.mp3 deleted file mode 100644 index 9179a131c..000000000 Binary files a/01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/01.geometrical-optics-general/02.geometrical-optics-validity/02.geometrical-optics-domain-of-validity-overview/OG_intro.mp3 and /dev/null differ