The brightest and most common rainbows are

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Primary rainbows are the brightest and most common rainbows. They are formed when sunlight is refracted and reflected within raindrops and appear as a multicolored arc with red at the outer edge and violet at the inner edge. Secondary rainbows appear outside of primary rainbows and are less bright. Moonbows are rainbows that are formed at night by the light of the moon and are much fainter than primary rainbows. Glories are optical phenomena that occur when sunlight is scattered back towards the observer by cloud droplets or small water droplets in fog or mist, producing a ring of colored light around the observer's shadow.

The Brightest and Most Common Rainbows Are