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光
在物理学中指的是各种波长的电磁辐射。但通常说的光,常狭义地指能引起人眼视觉的波长介于400~760纳米的电磁辐射,即可见光。广义上说,光包括各种波长的电磁辐射,其中有无线电波、微波、太赫兹辐射、红外线、可见光、紫外线、X射线、γ射线。
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