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以往在中学光学问题的讨论中,强调的是对某几条特殊光线的光路分析,如讨论透镜成像时的三条特殊光线,讨论全反射现象时恰能发生全反射的那条临界光线等。近几年来,随着需要对由大量光线组成的光束传播的总体情况进行讨论的光学问题的增多,对能表征光束在空间的分布范围的边界光线的分析,显得更为重要。1 确定像的观察范围像的观察范围是指位置可移动的人眼通过光学器件(如透镜、平面镜)能观察到像时,人眼可处的空间区域。怎样确定像的观察范围呢?应对通过
In the past, in the discussion of high school optical problems, the emphasis was on the analysis of the optical paths of certain special rays, such as the three special rays when discussing the lens imaging, and the critical rays that can fully reflect the total reflection phenomenon. In recent years, with the increase in the number of optical problems that require the discussion of the overall situation of beam propagation consisting of a large number of rays, the analysis of boundary rays that characterize the distribution of the beam in space has become more important. 1 The scope of observation for determining the image range of the image refers to the spatial area where the human eye can be positioned when the movable eye can observe the image by an optical device (such as a lens or a flat mirror). How do you determine the scope of observation?