目域的问题是指物体不动,眼睛的位置可动,眼睛在什么范围能看到需观察的像。分析这类问题的关键是确定边界光线。先作人射到光学元件边界的光线,再确定经过光学元件后的反射光线或折射光线,眼睛在这些反射光线或折射光线所包围的范围就能看到需观察的像。 The problem with the target area is that the object does not move, the position of the eye can move, and the eye can see the image to be observed. The key to analyzing this type of problem is to determine the border rays. First, the light that the person shoots on the boundary of the optical element is determined, and the reflected light or the refracted light after passing through the optical element is determined. The eye can see the image to be observed in the range surrounded by the reflected light or the refracted light.