Update textbook.en.md

01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/01.geometrical-optics-general/01.geometrical-optics-validity/01.geometrical-optics-domain-of-validity-main/textbook.en.md

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 title: 'Validity domain of geometric optics'
+published : false
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 ###Domaine de validité de l'optique géométrique