Thursday, May 30, 2013

The rainbow: The white light fission

There are few simple things that get the admiration of children and adults at the same time. Two
simple creations of the universe, light and water collide to create one of the most sublime spectacles of our planet: the Rainbow. Revered for a century by its mysterious appearance, his explanation is simple laws of optics. However, fantasy and fables have fueled supernatural legends that give a mysticism that humans, despite the progress of science and technology, decide to treasure.
A rainbow is an optical and meteorological phenomenon that causes the appearance of a spectrum of continuous light in the sky when the sun's rays pass through water droplets contained in the Earth's atmosphere. The shape is the sum of a multicolored arc with red on the outside and violet on the inside.
More than three centuries ago, Isaac Newton was able to show with the help of a prism the white light of the Sun contains red based colors turn to orange, violet, on the black, for the blue and indigo to violet until . This separation of light into the colors that shape decomposition is called white light. The Rainbow Complete Theory was proposed in initial form by Thomas Young and later elaborated in detail by Potter and Airy.

How is it produced? A ray of sunlight, which "make" a rainbow, changes its direction three times while moving through a drop of water first enters the drop, which causes it to refract light. Then moves toward the opposite end of the drop, and is reflected on the inner face thereof. Finally, again refracted as it exits the raindrop shaped scattered light. Color decomposition is possible because the refractive index of the water drop is slightly different for each wavelength for each color of the rainbow.

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