Why is there a rainbow after the rain?

Best answer: After the rain, 空 air is filled with countless water drops that can deflect sunlight. When the sunlight passes through the water droplets, it not only changes the forward direction, but also is decomposed into red, orange, yellow, green, blue, indigo, purple and other colors. If the angle is appropriate, it will become the size of the water droplets in the air of the rainbow 空, which determines the colorful degree of the rainbow.

After the rain, 空 air is filled with countless water drops that can deflect sunlight. When the sunlight passes through the water droplets, it not only changes the forward direction, but also is decomposed into red, orange, yellow, green, blue, indigo, purple and other colors. If the angle is appropriate, it will become the size of the water droplets in the air of the rainbow 空, which determines the colorful degree of the rainbow.

Double Rainbow:

The optical principle of causing rainbows often sees two rainbows appear at the same time, and concentric but dark secondary rainbow (also called neon) appears outside the ordinary rainbow. The rainbow is formed by two reflections of sunlight in water droplets. The strongest reflection angle of the two reflections appears between 50 and 53, so the secondary rainbow is located outside the main rainbow. Because there are two reflections, the color sequence of the secondary rainbow is reversed from that of the primary rainbow, with the outer side being blue and the inner side being red. In fact, the auxiliary rainbow must follow the main rainbow, but because of its low light intensity, it is sometimes invisible to the naked eye (see).

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