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大家知道,一个发光点可看成是一个发散光束的顶点,人眼看到实物发光点,也就是光束的顶点,如图1所示。若发光点发出的光束被凸透镜折射,光线进入人眼时,人眼感觉仍是直接沿刚进入瞳孔前的光线方向来判断光束发散顶点的位置的,此时人眼看到的是顶点P′点,因此人感觉发光点就在P′点,P′点是P点的实象,它是实际光线会聚点如图2。
As we all know, a luminous point can be seen as the vertex of a diverging beam. The human eye sees the physical luminous point, which is the vertex of the beam, as shown in Figure 1. If the light beam emitted by the light-emitting point is refracted by the convex lens and the light enters the human eye, the human eye feels that the position of the light-emitting divergence vertex is directly determined by the direction of the light just entering the pupil. At this time, the human eye sees the vertex P′. Therefore, the person feels that the light point is at the P′ point, and the P′ point is the real image of the P point, which is the actual light convergence point, as shown in FIG. 2 .