Our Physics review sheet includes two questions involving "accelerating voltage", "deflecting voltage", and "screen deflection", which are involved with Cathode Ray Tubes. The chapter on this in the book basically outlined what one was and how it worked, but it did not make use of any of these terms and I'm at a loss at how to solve the problems. One of them is: An accelerating voltage of 750 V produces a screen deflection of 4.2 cm on a CRT. If the deflecting voltage is kept constant but the accelerating voltage is increased to 1000 V, what will the deflection become? There appear to be two voltages to keep track of, and so none of my equations seem to apply here. Would someone please explain to me what to do?