LAURENT LAVEDER / SCIENCE PHOTO LIBRARY LAURENT LAVEDER / SCIENCE PHOTO LIBRARY
Fog bow. Misty rainbow-like arc, known as a fog bow or white rainbow, above a boat lying on a beach at low tide. Unlike rainbows, fog bows are caused by diffraction of light rather than refraction and reflection. Because the droplets in fog are smaller than in rain, the optical interference is greater, and the light that emerges is completely colourless. Photographed in Brittany, France.
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