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why do rainbows appear in the sky after it rains

and a stratum of rains simultaneously then you can get two rainbows at a time. Some rainbows form as an arc or a semi circle and that is because rainbows are only partial part of a circle around the shadow of your head on which rainbows are seen. You can mostly only see circled rainbow from above like in an aircraft. When the water drops get very small the wave like nature of light starts to dominate which will wash out the colors in a rainbow until the drops are too small and a rainbow will not been seen at all.

So a complete circular rainbow seen from an aircraft is going to look whiter than colored, with the shadow of the aircraft seen in the center.
Rainbows happen when sunlight and rain combine in a very specific way. The beams of sunlight separate into the colors we see in the rainbow as they enter a raindrop.

Sunlight is actually made up of different colors that we don t usually see. When a beam of sunlight comes down to Earth, the light is white. But, if the light beam happens to hit raindrops on the way down at a certain angle, the different colors that make up the beam separate so that we can see them in the form of a rainbow. The angle for each color of a rainbow is different, because the colors slow down at different speeds when they enter the raindrop.

The light exits the raindrop in one color, depending on the angle it came in, so we see only one color coming from each raindrop. Light at different angles coming through many raindrops form the rainbow that we see, in stripes of red, orange, yellow, green, blue, indigo and violet.

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