How Do Night Vision Glasses Work?

Answer

Night vision glasses, used for seeing pitch in the dark night, use the little light available to form an image of sufficient brightness to be seen. The image is first focussed, as in a camera, on to a window which is coated with particular chemicals containing sodium, potassium, cadmium and oxygen compounds which produce electrons when illuminated. The electrons so emitted are then accelerated by a series of influential electric fields and made to fall onto another screen coated with fluorescing chemicals which glows recreating a much brighter image of the original scene.
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