Archived from the original on April 28, Main article: Cathode ray tube. The latter is essentially a magnetic lens ; it focuses the "crossover" between the CRT's cathode and G1 electrode, where the electrons pinch together and diverge again onto the screen. Assuming that they start from a point, the electrons will focus to a point again at a distance determined by the strength of the field. In a magnetically focused camera tube there are electrostatically focused vidicons , the vertical deflection coils are above and below the tube, instead of being on both sides of it. Thus the contributing images could be separated without any reference electrodes in the tube. Thanks to the axial magnetic field of the focusing coil , this deflection is not in a straight line, thus when the electrons reach the target they do so perpendicularly avoiding a sideways component.
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