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题目:有一凸透镜,焦距为f,今于其主光轴上置一点光源S,要求人眼在某一位置能同时看到此点光源和它的像. (1)S与透镜相距应为多远? (2)画图说明人眼所在的所有可能位置.
Title: There is a convex lens with a focal length of f. Now set a point light source S on its main optical axis, requiring the human eye to see this point light source and its image at a certain position. (1) The distance between S and the lens should be more Far? (2) The drawing illustrates all possible positions of human eyes.