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近年来,中考中出现了一些数学与物理 知识相渗透的跨学科试题．这类题型源于生 活,贴近实际,知识面宽,多运用数形结合 法,要求较高．现从部分省、市中考题中精选 出相似三角形与光学综合题数例,以飨读者． 例1(2003年山东济南)检查视力时, 规定人与视力表之间的距离应为5米．如图 1,现因房间两墙壁的距离为3米,因此借助 于平面镜来解决房间小的问题．若使墙壁镜 子能呈现出完整的视力表,如图2,由平面镜
In recent years, there have been some cross-discipline questions that have penetrated mathematics and physical knowledge. This type of question originates from life, is close to reality, and has a wide range of knowledge. A number of examples of similar triangles and optical composites have been selected from the examination questions of some provinces and municipalities for readers. Example 1 (Jinan, Shandong, 2003) When checking vision, the distance between the person and the eye chart should be 5 meters. As shown in Figure 1, because the distance between the two walls of the room is 3 meters, the plane mirror is used to solve the problem of small rooms. If the wall mirror can present a complete visual acuity chart, as shown in Fig. 2, the plane mirror