光束
光束是從光源發出的一束直線走向的定向光的集合。阳光經過云层、树叶或窗户等介质后可以形成光束(太陽光束);光束也可以由人工生成[1],在许多照明设备中,為了能發出光束,這些設備用到了電光源和拋物面反射器,例如前照燈、抛物面鍍鋁反射燈和發光二極管。
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幻彩詠香江的光束
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洞穴裡面的太陽光束
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