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電磁波(英文:Electromagnetic wave)係電磁輻射喺空間中嘅郁動形式,唔同嘅波長會產生唔同嘅形態,由長到短包括無線電波、微波、紅外線、可見光、紫外線、X射線同伽馬射線,其中可見光係指人眼可以接收到嘅電磁波,波長大約喺380至780nm之間。
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