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在初中物理不少参考资料上有类似这样一道练习:把指尖紧压在平面境上,此时指尖与指尖在平面镜中的像间相距为6mm,则平面镜的厚度为
There is a similar exercise on many reference materials for junior high school physics: press the fingertips in a plane, and the distance between the fingertip and the fingertip in the mirror is 6mm, then the thickness of the mirror is