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对自己的眼睛,我们熟悉而又陌生,其中包含无数的奥秘……人眼分辨率的视角极限约为1′,这相当于在“明视距离”(25厘米)处能看到线度约0.1毫米的物体。所以,“在太空中或月球上能看到中国的万里长城”是无稽之谈。人眼能引起视觉的光的波长范围是380~730纳米,也就是紫光到红光的范围。有的电磁波(如红光外线、紫外线、γ射线)的波长超出了这个范围,肉眼就直接看不到——一
We are familiar and unfamiliar with our own eyes and countless mysteries ... The human eye resolution has a viewing angle limit of about 1 ’, which is equivalent to seeing the line at “25 ” Degree of about 0.1 mm object. Therefore, “the Great Wall of China can be seen in space or on the moon” is nonsense. The human eye can cause visual light wavelength range is 380 ~ 730 nm, which is the range of violet to red light. Some electromagnetic waves (such as red light, ultraviolet light, γ-ray) wavelength beyond this range, the naked eye can not see directly