Legends often say that there is a pot of gold at the end of a rainbow. But rainbows don’t actually end.
The illusion of a great circle In reality, a rainbow is a perfect circle. Sunlight, falling on a raindrop, is refracted and reflected, then emerges at a certain angle, about 42°. At that same angle, the rays coming from many drops reach our eyes. If we could see all these rays at once, we would see a completely bright circle. Why do we only see a bow? The reason is very simple: the Earth “interferes” with us. The horizon cuts off the lower part of this circle, and we see only the upper half, the bow of the rainbow
