关于透镜的一个问题.原题为英文.原题：The image of an object formed on a screen by a convex lens has height A.By moving the lens towards the screen,it is found that there is a second lens position at which another image of height B is

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关于透镜的一个问题.原题为英文.原题：The image of an object formed on a screen by a convex lens has height A.By moving the lens towards the screen,it is found that there is a second lens position at which another image of height B is
关于透镜的一个问题.原题为英文.
原题：The image of an object formed on a screen by a convex lens has height A.By moving the lens towards the screen,it is found that there is a second lens position at which another image of height B is formed on the screen.The height of the object is
根号(AB) 为什么?
翻译：一个物体通过凸透镜投射到屏幕上的像高度是A,向屏幕方向移动凸透镜,直到物体的像高度是B,求物体的高度.

关于透镜的一个问题.原题为英文.原题：The image of an object formed on a screen by a convex lens has height A.By moving the lens towards the screen,it is found that there is a second lens position at which another image of height B is
因为物体、光屏位置没有发生变化,只移动了透镜,所以,第一次的物距,就是第二次的像距.
设物距离为u,像距为v,物体高为h
第一次成像时：h：A＝u：v
第二次成像时：h：B＝v：u ,变形为：B：h＝u：v,即第二次的物距是第一次的像距
所以：h:A＝B:h
解出：h＝√AB
关键要理解第一次的物距是第二次的像距.
不明追问.

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