看有光(khuànn-ū-kng,英文:visible light)是人的目睭看會著的電磁波,範圍無真明確,普通人看會著波長400到700奈米(nm:nanometer),有的人會當看甲380到780奈米,適應光線了後,目睭對波長555奈米的綠色上敏感。

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