来源：CCTV纪录微博 | 2022-04-19 08:22:00 |
近日，邢台市柏乡县天空出现“幻日”奇观。三个“太阳”在天空中同框出现，还有一挂彩虹。三个太阳和一挂彩虹同框的画面有多美？产生这种光学现象的原理是什么？
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