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透镜成像作图是教学中的一个难点．其实,只要找出透镜成像作图的规律,掌握其实质,便可化难为易．透镜成像作图的要点可概括为:“三线,两点,一对应”．所谓三线就是我们通常说的三条特殊光线．即:①通过光心的光线不改变传播方向;②平行于主光轴的光线折射后通过透镜的焦点;(或折射线的延长线通过焦点)③通过焦点(或延长线通过焦点)的光线折射后平行于主轴．两点:就是指物点和像点．其意义是: 所有的人射光线必过物点(光线从物点发出), 所有的折射光线必过像点(或延长线过像点)．
Lens imaging is a difficult point in teaching. In fact, as long as the law of imaging imaging of the lens is found and its essence is grasped, it can be made difficult. The main points of imaging imaging can be summarized as: “Three lines, two points, one correspondence”. The so-called three-line is the three special rays we usually say. Namely: 1 the light passing through the optical center does not change the direction of propagation; 2 the light parallel to the main optical axis refracts through the focal point of the lens; (or the extension of the refractive line passes through the focal point) 3 the light passes through the focal point (or the extension line passes through the focal point) After refraction parallel to the main axis. Two points: points and points. The significance of this is: All people must shoot light (the light is emitted from the object point), and all the refracted light must pass through the image (or extend the line past the image point).