The phosphor is usually green because the human eye is more sensitive to green than other colors and because historically the original material used to produce phosphor screens produced green light ( hence the soldiers'nickname'green TV'for image intensification devices ).
12.
Like the more advanced scopes that the military now uses, they work on the principle of image intensification, taking a small amount of reflected moonlight or starlight and converting it in a vacuum tube to electrons, which are then accelerated in an electrically charged field and displayed as an image on a phosphor screen, usually green.
