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为什么彩虹有七种颜色？

彩虹是自然界中美丽的现象之一，由七种颜色组成。这是因为光在经过水滴时会发生折射、反射和散射现象。当太阳光进入水滴后，会发生折射并分解成七种不同的颜色，包括红、橙、黄、绿、蓝、靛、紫。这些颜色的波长不同，因此在我们的眼睛中呈现出不同的颜色。

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