Şi, totuşi, cineva a avut norocul nu numai să vadă cu ochii lui un curcubeu perfect, ci şi să îl poată fotografia în toată splendoarea lui. Curcubeul acesta s-a format în oraşul Cotswold din Marea Britanie.
Curcubeul e, fără îndoială, unul dintre cele mai frumoase fenomene din atmosferă. Apare, sub forma de arc de cerc, atunci când lumina se refractă în picăturile de apă din atmosferă. Curcubeul se observă, de cele mai multe ori, după ploaie, când soarele este apropiat de orizont.
Atunci când întâlneşte un strop mărunt de apă, lumina albă se descompune în secvenţe individuale corespunzătoare culorilor din spectricul vizibil. Este acelaşi fenomen care se petrece atunci când lumina intră într-o prismă optică.
Deşi orice curcubeu ar fi, teoretic, perfect rotund, forma suprafeţei terestre face imposibilă completarea imaginii cercului. Un curcubeu de 360 de grade se poate vedea doar din spaţiu şi doar din anume unghiuri. Când stam cu picioarele pe Pământ, curcubeul perfect arată aşa cum e cel din imagine: o impecabilă jumătate de cerc.
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