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透镜成像公式是对透镜成像规律的定量分析.新统高中物理必修教材上,对凸透镜成像的规律进行了公式的推导,从而得到了物距、像距和焦距三者的关系.而对于凸透镜成虚像、凹透镜成像并未进行公式推导,只是通过对物距、像距和焦距三者的正、负号进行了说明.这样一来学生在解题中,正、负号问题较大,错误率极高.笔者认为,在教学中应穿插凸透镜成虚像、凹透镜成像规律的推导,然后对三种规律进行比较分析,寻找三种规律中的普遍性和特殊性,从而让学生加深印象,真正起到事半功倍的效果.
The lens imaging formula is a quantitative analysis of the imaging law of the lens. On the compulsory textbook of the Physics of New Senior high school, the formula of the imaging law of the convex lens is deduced, and the relation between the object distance, image distance and focal length is obtained. The convex lens is formed. The virtual image and the concave lens imaging have not been deduced by the formula, but the positive and negative signs of the object distance, image distance, and focal length have been described. As a result, students have larger positive and negative sign problems in solving a problem. Very high. The author believes that in the teaching should be interspersed into a virtual lens, concave lens imaging law derivation, and then compare the three laws to find the three laws of universality and particularity, so that students deepen the impression, really The effect of doing more with less.