Extraordinary Weather by Richard Hamblyn

Author:Richard Hamblyn [Hamblyn, Richard]
Language: eng
Format: epub
ISBN: 978-1-4463-5623-4
Publisher: F+W Media
Published: 2012-06-14T16:00:00+00:00

Rainbow above Victoria Falls

This photograph, taken in September 1989, shows a rainbow formed in the spray of the world’s largest waterfall, Victoria Falls, on the Zimbabwe–Zambia border in southern Africa. The falls’ local name, Mosi-oa-Tunya, which translates as ‘the smoke that thunders’, describes both the noise and the spray thrown up by the plunging waters as they fall some 108m (360ft) into the first of a series of gorges carved by the Zambezi River. Rainbows (or, at night, moonbows) often appear above waterfalls, where mists of airborne water droplets disperse sunlight into the familiar colours of the visible spectrum: red, orange, yellow, green, blue, indigo and violet. White light is refracted as it enters the droplet, then reflected off the back surface, then re-refracted on the way out at a wide range of angles. A rainbow can be seen only when the sun is directly behind the observer and the airborne droplets are directly in front.

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