光束是从光源发出的一束直线走向的定向光的集合。阳光经过云层、树叶或窗户等介质后可以形成光束(太阳光束);光束也可以由人工生成[1],在许多照明设备中,为了能发出光束,这些设备用到了电光源抛物面反射器,例如前照灯抛物面镀铝反射灯发光二极管

幻彩咏香江的光束
洞穴里面的太阳光束

参考文献

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