Night vision goggles boost a dim, dark scene in a series of simple steps:
Dim light from a night scene enters the lens at the front. The light is made of photons (particles of light) of all colors.
As the photons enter the goggles, they strike a light-sensitive surface called a photocathode. It's a bit like a very precise solar panel: it's job is to convert photons into electrons (the tiny, subatomic particles that carry electricity round a circuit).
The electrons are amplified by a photomultiplier, a kind of photoelectric cell. Each electron entering the photomultiplier results in m..