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Efectul corona

Corona este un fenomen optic care apare la refracția luminii în apă.

Este un inel luminous centrat în jurul soarelui sau a lunii. Inelul are de multe ori o umbră albastră la interior și o tonalitate roșie la exterior.

Este observabil atunci când lumina soarelui sau a lunii trece prin picăturile de apa din nori, apărând ca și rezultat al luminii care se refractă prin apă, ca o strălucire printr-o ceață difuză sau prin nori rarefiați.

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