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本文所讨论的两个问题,其结论为人们所熟知并加以应用,但其正确性的证明、特别是用初等方法的证明,笔者尚未从书刊上见到。在这里用初等方法对这两个问题做一简要讨论。一、倾斜直线段的像是否也为直线段在用作图法求一直线段AB由凸透镜所成的像时,往往只用作图法分别作出线段二端点A和B的像A′、B′,然后连结A′、B′,所得直线段A′B′即为AB的像。在
The two issues discussed in this paper are well-known and applied, but the proof of their correctness, especially the use of the elementary method, has not yet been seen in the books. Here is a brief discussion of these two issues using the elementary method. Whether or not the image of the inclined straight line segment is also a straight line segment When the image formed by the convex lens is used to obtain the straight line segment AB used as a graph, it is often used as a picture only to create the images A′ and B′ of the two endpoints A and B of the line segment respectively. Then, A′ and B′ are connected, and the resulting straight line segment A′B′ is the image of AB. in