| night sight |
Night vision is seeing in the dark. There are two ways to accomplish this; biologically, and through technology. Technological night vision works on one of two principles. The first is by detecting infrared radiation, which is a form of energy emitted by all objects regardless of the ambient light conditions. A device based on this principle is called an infrared camera. The second is by intensifying the small amount of light present even at night, from the stars and the moon. ...
출처: en.wikipedia.org/wiki/Night_sight
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