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探究就是探索和研究,俗话说:“授之以鱼,不若授之以渔”.引导学生学会科学探究的方法是教学的主要目的.学生通过观察、记录、分析能够得出:1f处是虚像、实像的分界点;2f处是放大、缩小实像的分界点.学生还能够联系生活中的照相机猜想:因为镜头是凸透镜,所以同样也可以成放大的像,如长期的照片旧了,要翻版,如果把它放在凸透镜lf到2f之间的位置,是否可以照出放大的像?我把这个课题留给学生课外实践.
Exploration is to explore and research, the saying goes: “The teaching of fish, not granted if the fishing ” .Guide students learn scientific inquiry method is the main purpose of teaching.Students through observation, record, analysis can be drawn: 1f 2f Department is to enlarge, reduce the real image of the demarcation point .Students can also contact the camera in life guess: because the lens is convex lens, so it can also be an enlarged image, such as long-term photos of the old If you put it in the position between the convex lens and the lens lf to 2f, can I enlarge the image? I leave this subject to students’ extracurricular practice.