Luc ce646cc8d6 Added the section of reflection and refraction to optics.		2024-01-20 18:27:34 +01:00
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en	Added the section of reflection and refraction to optics.	2024-01-20 18:27:34 +01:00
nl	Updated indexing.	2024-01-03 13:39:36 +01:00