八年级《物理》(人教版)上册第68页的图3.4-1是一幅眼睛的结构示意图,如图1所示.眼睛是用来观看外界的人体重要器官,你知道眼睛是如何看到景物的吗?人眼的构造虽然复杂,但作为核心部件的眼球,却好像一架照相机,瞳孔就像照相机的光圈,可随光线的强弱变大或缩小,控制眼球的进光量.晶状体和角膜的共同作用相当于一 Figure 3.4-1 on page 68 of the eighth grade “Physics” (PEP) is a schematic diagram of the structure of an eye, as shown in Figure 1. The eye is used to watch the external vital organs, you know how the eyes look Into the scene? Although the human eye structure is complex, but as the core part of the eye, it looks like a camera, the pupil is like the camera’s aperture, can be increased or decreased with the light intensity, to control the amount of light into the eye. The joint action with the cornea is equivalent to a