Question

Diagram shows an electron gun inside a cathode ray tube. Label the screen with the letter S.

Answer 1

Electron guns are devices often used by cathode ray tube displays in order to produce light on a phosphorus-coated glass screen. The electron gun generates a beam of electrons which is targeted at the screen.

The beam can be deflected on all three axes by the image driver with the help of either a magnetic or an electric field, thus creating an image pattern on the screen. Electrons are being absorbed into the phosphorus layer, exciting it in order to emit photon particles of light.