一种手电筒上所用的聚光小电珠其前端相当于一个玻璃制成的凸透镜.灯丝(可看作一个点光源)发出的光通过它出射时,出射光束(图中实线所示)比无此透镜时的光束(图中虚线所示)要
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![一种手电筒上所用的聚光小电珠其前端相当于一个玻璃制成的凸透镜.灯丝(可看作一个点光源)发出的光通过它出射时,出射光束(图中实线所示)比无此透镜时的光束(图中虚线所示)要](/uploads/image/z/6324244-52-4.jpg?t=%E4%B8%80%E7%A7%8D%E6%89%8B%E7%94%B5%E7%AD%92%E4%B8%8A%E6%89%80%E7%94%A8%E7%9A%84%E8%81%9A%E5%85%89%E5%B0%8F%E7%94%B5%E7%8F%A0%E5%85%B6%E5%89%8D%E7%AB%AF%E7%9B%B8%E5%BD%93%E4%BA%8E%E4%B8%80%E4%B8%AA%E7%8E%BB%E7%92%83%E5%88%B6%E6%88%90%E7%9A%84%E5%87%B8%E9%80%8F%E9%95%9C%EF%BC%8E%E7%81%AF%E4%B8%9D%EF%BC%88%E5%8F%AF%E7%9C%8B%E4%BD%9C%E4%B8%80%E4%B8%AA%E7%82%B9%E5%85%89%E6%BA%90%EF%BC%89%E5%8F%91%E5%87%BA%E7%9A%84%E5%85%89%E9%80%9A%E8%BF%87%E5%AE%83%E5%87%BA%E5%B0%84%E6%97%B6%2C%E5%87%BA%E5%B0%84%E5%85%89%E6%9D%9F%EF%BC%88%E5%9B%BE%E4%B8%AD%E5%AE%9E%E7%BA%BF%E6%89%80%E7%A4%BA%EF%BC%89%E6%AF%94%E6%97%A0%E6%AD%A4%E9%80%8F%E9%95%9C%E6%97%B6%E7%9A%84%E5%85%89%E6%9D%9F%EF%BC%88%E5%9B%BE%E4%B8%AD%E8%99%9A%E7%BA%BF%E6%89%80%E7%A4%BA%EF%BC%89%E8%A6%81)
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