“凸透镜的会聚作用”教学建议顾康清（江苏省如皋市如城二中，２２６５００）问起凸透镜对光线有何作用，学生一般都能答出“会聚”．若再追问下面的图１和图２中哪一种光路图体现了凸透镜的会聚作用，多数学生都会认为是图１．图１图２诚然，图１确实体现了凸透镜对光线... “Guangxue Convergence Effect” Teaching Suggestion Gu Kangqing (Ren 2nd, Rugao City, Jiangsu Province, China, 226500) Asked about the effect of the convex lens on light, students can generally answer “convergence”. If we ask which of the light path diagrams in Fig. 1 and Fig. 2 below shows the convergence of the convex lens, most students will think that it is Fig. 1. Figure 1 Figure 2 Indeed, Figure 1 does reflect the convex lens to the light...