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image intensifier| Electronic device that brightens a dark image. Image intensifiers are used for seeing at night; for example, in military situations. |
| The intensifier first forms an image on a photocathode, which emits electrons in proportion to the intensity of the light falling on it. The electron flow is increased by one or more amplifiers. Finally, a fluorescent screen converts the electrons back into visible light, now bright enough to see. |
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