The Goldfish Over the Rainbow

• Autores: Carlos E. Aguilar, Antonio C.F. Santos, Eric B. Lopes, Walter S. Santos
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 51, Nº. 9, 2013, págs. 522-523
• Idioma: inglés
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• Resumen

  • A goldfish isn't always visible inside its fishbowl. If the fish gets sufficiently close to the bowl glass, it will disappear for certain angles of observation. In a recent paper in this journal, 1 Zhu and Shi explained the effect in terms of total internal reflection. We show in what follows that the phenomenon involves some richer optics: a rainbow defines one of the boundaries of the �blind zone� where the fish disappears.