Have you ever seen a colorful rainbow in the sky right after it rains? That happens when the sunlight goes through the water in the air.
The sun's light is actually made of many colors that don't all move the same way. When this light goes into a raindrop, it bends (弯曲) a bit and splits into (裂成) all these colors like red, orange, yellow, green, blue, and purple.
As these colors come out of the raindrop, they bounce off (弹回) the inside back of the drop. This makes them bend again and spread out, making a shape like part of a circle, which is the rainbow we see. Purple bends a lot, but red not so much.
So, why do rainbows look like a curve? It's because the raindrops are not all the same distance (距离) from us. They make a circle shape around a line from the sun to our eyes, creating that curve.
Rainbows are usually seen in the part of the sky opposite the sun. Sometimes, you might even see two rainbows at once! That's when the sunlight bounces twice inside the raindrops.
Next time you see a rainbow, remember it's just the sun and rain working together to make something really special and pretty in the sky.
①Sunlight goes into a raindrop. ②The sunlight splits into many colors. ③Colors bounce off the inside back of the drop. ④The colors bend again and spread out.
