Deflection Yoke - pictured below, wraps around the neck on the CRT and extends partway up along the sloped sides. The yoke has signals running through it's wires that create a strong electrical/magnetic field - rapidly deflecting the electron beam, scanning across the screen to paint full frames at a rate of 60 frames per second. The entire concept is truly amazing.
The electrons emitted from the cathode makes an electron cloud. This electron cloud then forms the electron beam. This electron beam then with the help of the yoke or the combined horizontal and vertical scanning coil moves left-right and up-down. By this process the beam hit the screen of the CRT. As the CRT has many dots which are light sensitive and coated with the phosphors. The phosphor chemicals are light metals as Zinc (Zn) and Cadmium (Cd) in the form of Sulphide, Sulphate and Phosphate compounds.
