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有些物理题学生难于理解,或者读懂了也感到难以入手。尤其是非重点中学的学生,教师在习题课上要善于布设情景,创造氛围,诱导学生,使他们顿开茅塞豁然开朗。现以92年上海市高考题为例说明。题目:某人透过焦距 f=6厘米,直径 d=3厘米的凸透镜看报,将离眼16厘米处的报纸成像于24厘米处,为此应使透镜与报纸相距——厘米。设眼在透镜主轴上,报纸平面垂直于主轴,若报上密排着宽、高各为0.3厘米的铅印字,则通过透镜至多能看清同一行上____个完整的字。
Some physics problems are difficult for students to understand, or they will find it hard to get started. Especially for non-key high school students, teachers should be good at setting up situations, creating atmosphere, and inducing students to make them suddenly open in the exercises. The 92-year Shanghai college entrance examination question is now used as an example. Title: Someone reads through a convex lens with a focal length of f=6 cm and a diameter of d=3 cm. The newspaper 16 cm away from the eye is imaged at a distance of 24 cm. For this purpose, the distance between the lens and the newspaper should be -cm. Let the eyes be on the lens spindle. The newspaper plane is perpendicular to the main axis. If the report is accompanied by printed letters with width and height of 0.3 centimeters each, at most ____ complete words on the same line can be seen through the lens.