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照明灯上为什么要装灯罩？

浏览：41次 | 提问时间： 07-30 10:29
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2个答案
久伴成瘾 07-30 10:29

灯罩一般都是抛物线的，灯泡在抛物线的焦点上，而且大部分都是白色或者金属色的，从物理学上说，这些都可以帮助灯泡的光反射，会起到增强亮度的作用

卖萌无罪 07-30 10:38

灯罩一般都是抛物线的，灯泡在抛物线的焦点上，而且大部分都是白色或者金属色的，从物理学上说，这些都可以帮助灯泡的光反射，会起到增强亮度的作用。在家居的情况，聚光，阻止飞蛾也是一个用处。通过灯罩后，在灯罩处的温度就比较低了，飞蛾扑火也不会被烫*，落得到处都是。防止风*雨淋损坏  防止温度过低  防止外力破坏  防止被盗。灯泡直接接触空气雨水骤冷骤热会爆的。

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