Night Vision scopes and binoculars are electro-optical devices that intensify
(or amplify) existing light instead of relying on a light source of their
own. The devices are sensitive to a broad spectrum of light, from visible
through infrared. An accessory illuminator can increase the light
available at the infrared end of the spectrum by casting a beam of light
that is not visible to the human eye.
You do not look "through" a Night Vision product, you look at
the the amplified electronic image on a phosphor screen.
Light enters the Night Vision product through an objective lens and strikes
a photo cathode that has a high energy charge from the power supply. The
energy charge accelerates across a vacuum inside the intensifier and strikes
a phosphor screen (like a TV screen) where the image is focused. The eyepiece
magnifies the image.
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