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    Question ID:   4012         Current Version: 1
Question: What makes a double rainbow?
Category: Science > Weather
Keywords: form, make, double, rainbow
Type: what
Rating:(0 ratings)    Views: 623    Discussions: 0   In Watch Lists: 1  

 
    Answer:
Sometimes we see two rainbows at once. What causes this? We have followed the path of a ray of light as it enters and is reflected inside the raindrop. But, not all of the energy of the ray escapes the raindrop after it is reflected once. A part of the ray is reflected again, and travels along a different path inside the drop to emerge from the drop at a different angle. The rainbow we normally see is called the primary rainbow and is produced from one internal reflection. The secondary rainbow arises from two internal reflections and the rays exit the drop the second time at an angle of around 50o, rather than the 42o for the primary rainbow. This effect produces the secondary rainbow, with the colors reversed from the primary rainbow. It is possible for light to be reflected more than twice within a raindrop, but these additional rainbows are typically never seen under normal circumstances.
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