lunes, 29 de octubre de 2007

¿Por qué sale el Arco Iris?

El Arco Iris es un fenómeno óptico y meteorológico que consiste en un conjunto ordenado de arcos multicolor, todos con el mismo centro; los colores que se ven en este bonito y curioso fenómeno son el rojo, naranja, amarillo, verde, azul, violeta y añil (morado, entre el azul y el violeta), aunque es complicado verlos todos.

El Arco Iris aparece en el cielo cuando llueve y se produce porque un rayo de luz del Sol incide en las gotas de la lluvia y descompone ese rayo en todos sus colores; la luz del sol contiene todos los colores del Arco Iris.

Cuando vemos el Arco Iris, siempre tenemos el sol en nuestra espalda y por encima; la lluvia forma una cortina delante nuestro y es sobre ella donde vemos este Arco.Sólo es un efecto óptico, una imagen momentánea.

El Arco Iris se produce desde los tiempos de nuestros antepasados y se consideraba algo asombroso y sobrecogedor. Fue René Descartes (filósofo, matemático y científico) quien explicó su formación en el año 1.637.
Isaac Newton (científico, físico, filósofo, alquimista y matemático) demostró que la luz blanca del Sol bajo ciertas condiciones se descompone en una variedad de colores: rojo, naranja, amarillo, verde, azul, morado y violeta: los del Arco Iris!

Ocasionalmente podemos ver un segundo Arco Iris, por detrás del principal; esto es debido a que la luz del Sol vuelve a reflejarse en otra cortina de agua más lejana.

También es posible ver pequeños Arco Iris al regar el jardín, o el césped de un parque, en cascadas o fuentes de agua. Lo curioso es que ninguno vemos el mismo Arco Iris, ya que depende de dónde nos encontremos veremos un reflejo de la luz u otro.

Una leyenda asegura que allí donde termina el Arco Iris, podemos encontrar un caldero lleno de monedas de oro, pero cuanto más nos acercamos a él, más lejos parece estar...

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