I might be stupid by not knowing this, but I suddenly got an item on my bucket list.

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[–] 3 points 2 days ago (1 child)

It's related to the number of total internal reflections inside a raindrop. The 2nd rainbow is actually inverted, colour wise. The 3rd inverts again, and so is normal. Each reflection loses more light however, so it gets dimmer. 3 is the practical limit in the sky, with our eyes. In the lab version, at least 18 rainbows can be detected, even by undergraduate level students!

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