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Home → Other → GeoPicture

GeoPicture of the Week: Complete double rainbow encircles Australian town

Mihai Andrei by Mihai Andrei
October 22, 2014
in GeoPicture

For our GeoPicture of the Week, we've gotten used to pictures of minerals, fossils or geological phenomena - but today, I want to show you something different: a stunning, complete, double rainbow:

C. LEONHARDT/BIRDSEYE VIEW PHOTOGRAPHY

The picture was taken from a helicopter flying over Cottesloe Beach in Western Australia. Rainbows appear because water droplets act like prisms, separating visible light into its constituent spectral colors - the colors of the rainbow. When the bands of color reach the far end of the drop, they bounce back toward the sun; people with their backs turned on the sun can see the rainbow - or more likely, half of it.

All rainbows are round, but we almost never see it. Seeing a full circle requires a viewing area with plenty of droplets in all directions, like for example when you are flying, like in this picture.

The second, dimmer rainbow appears when light bounces two times in the water droplets before coming back. For this reason, it is much dimmer than the first one.

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      • Dinosaurs
      • Fossils
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      • Fish
      • Amphibians
      • Reptiles
      • Invertebrates
      • Pets
      • Conservation
      • Animal facts
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      • Climate change
      • Weather and atmosphere
    • Health
      • Drugs
      • Diseases and Conditions
      • Human Body
      • Mind and Brain
      • Food and Nutrition
      • Wellness
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      • Anthropology
      • Archaeology
      • History
      • Economics
      • People
      • Sociology
    • Space & Astronomy
      • The Solar System
      • Sun
      • The Moon
      • Planets
      • Asteroids, meteors & comets
      • Astronomy
      • Astrophysics
      • Cosmology
      • Exoplanets & Alien Life
      • Spaceflight and Exploration
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      • Computer Science & IT
      • Engineering
      • Inventions
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