The process is very simple. First, a photographic plate is coated with a light sensitive material.
这个过程非常简单,首先,把照相底片用感光材料包裹起来。
First, the photograph plate is coated with light-sensitive material. Then the plate is position so the image seen by telescope is recorded on it.
首先,照相的地板要覆盖有感光材料,并把他们放置进去以便天文望远镜看到的图像能被记录下来。
Because only a small fraction of light reflects off the coating, the human eye and sensitive detectors see the material as black.
因为只有极小部分的光线能够反射出涂层,因此肉眼和灵敏的探测仪所观察到的这种材料依旧是黑色的。
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