diff --git a/01.curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/topic.en.md b/01.curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/reflexion-refraction-raytracing/topic.en.md
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rename from 01.curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/03.N3_theme_1_chap2-4/topic.en.md
rename to 01.curriculum/01.physics-chemistry-biology/03.foothills/01.Geometrical-optics/reflexion-refraction-raytracing/topic.en.md