一个凸透镜的焦距是10cm,当把物体放在凸透镜前28cm的位置时,在凸

一个凸透镜的焦距是10cm,当把物体放在凸透镜前28cm的位置时,在凸透镜后的光屏上出现一个倒立、的实像。小明站在平面镜前2m,他在平面镜中成的像距平面镜m

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