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为什么大雨时天空变暗？
大雨时天空变暗，主要是由于雨滴对光线的吸收、散射和反射作用，以及云层厚度的影响。以下是具体原因：
1、雨滴吸收光线：雨滴由水组成，水会吸收一部分光线，特别是当光线穿过雨滴时，红光等波长较长的光线被吸收得更多，导致整体光线减弱。
2、雨滴散射和反射光线：雨滴会对光线进行散射和反射，改变光线的传播方向。这种散射和反射使得光线无法直接到达地面，导致天空看起来更暗。
3、云层厚度增加：大雨通常伴随着厚重的云层。云层越厚，透光性越差，能够到达地面的光线就越少，因此天空显得更加阴暗。
总结：大雨时天空变暗，主要是因为雨滴吸收、散射和反射光线，以及厚重云层阻挡光线。这些因素共同作用，减少了到达地面的光线，使天空看起来更暗。
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