Electrostatic deflection is the method of aligning the path of charged particles by applying the electric field between the deflecting plates. The word electrostatic means the strength and the direction of the field changes concerning time. So that, the particles will move only in one direction. When an electron beam passes through an electric field a deflection may occur in the beam depending upon the relative direction of the field and the beam. The electrostatic deflection in cathode ray oscilloscope occurs on the basis of this phenomenon. The cathode ray tube uses deflecting plates for modifying the path of electrons. The electrons after exiting through the electron gun pass through deflecting plates. The CRT uses vertical and horizontal plates for focussing the electron beam
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