In old Tv the Cathode Ray Tube was a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen.
To create images the electrons must pass through a perforated plate, which directs the flow.Soon after, they collides with the fluorescent screen, which completely blocks the rays, transforming them into light.
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