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      "type": "text",
      "text": "光的折射"
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      "text": "[[折射率]]\n\n$n=\\frac{c}{v}\\ge1$\n\n斯涅耳定律：$n_{1}\\sin \\theta_{1}=n_{2}\\sin \\theta_{2}$"
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      "type": "text",
      "text": "负折射率\n\n负折射率超材料或负折射率材料（NIM）是一种人造光学结构，它的折射率对于一定频率范围内的电磁波是负值"
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