Two Rainbows at one time.

Описание: If you’ve seen a double rainbow, you’ve probably noticed that the secondary bow is much fainter than the primary bow.

You probably haven’t noticed, though, that the order of colors in the secondary bow is blue on the outside and red on the inside, the reverse of that in the primary.

In order to understand the origin of the secondary bow, we have to go back to our ideal raindrop—remember, of course, that it actually takes zillions of drops to make up a secondary rainbow as well.

Some of the light rays entering the drops reflect just once; others reflect twice before exiting. While light rays entering any given raindrop can reflect many times inside it, the primary bow is only created by those that reflect once.

The secondary bow, on the other hand, is created only by those that reflect twice inside before refracting on the way out. This extra bounce inside the raindrop is the reason the colors are reversed in the secondary bow.
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