冷光我们知道,夜光表能够在黑暗中发亮,接通了电,日光灯就能够放光;用紫外线照射我们的指甲,它会发出蓝光。这些现象就是“发光”。发光和物体对光线的反射最大的不同点之一,就是延续性不同。在入射光除去以后,反射光几乎同时就没有了。而在紫外线消失以后,指甲上的光好像也“立即”消失,但是事实上,指甲的光是延续了一些时间的(万万 The cold light we know, the luminous watch can shine in the dark, connected to the electricity, the fluorescent light can be radiating; with ultraviolet light on our nails, it will emit blue light. These phenomena are “lighting.” One of the biggest differences between the luminescence and the reflection of light by objects is the difference in continuity. After the incident light is removed, the reflected light is almost absent at the same time. After the disappearance of ultraviolet rays, the light on the nails seems to have “immediately” disappeared. However, in fact, the light of the nails has continued for some time.