十万个为什么·科学阅读30篇（3）
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How Do Rainbows Form?
彩虹是怎么形成的？
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Rainbows appear after rain when the sun shines.
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Sunlight is made of many colors mixed together.
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Raindrops act like tiny prisms in the sky.
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They bend and split sunlight into colors.
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Red bends the least, violet bends the most.
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We see the colors in a curved band.
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You can only see a rainbow from behind you.
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The sun must be at your back.