Deleted...

Deleted 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/02.refractive-index/04.refractive-index-parallel-1/default.en.md, 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/02.refractive-index/04.refractive-index-parallel-1/default.es.md, 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/02.refractive-index/04.refractive-index-parallel-1/default.fr.md files