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Post-deflection acceleration is applied in a cathode ray tube in order to obtain

  • A.a beam that remains focused however far it is deflected
  • B.a bright trace without loss of sensitivity
  • C.a longer persistence than the phosphor alone would provide
  • D.deflection in two directions from a single pair of plates

Answer: B

A spiral or mesh electrode beyond the deflection plates raises the beam energy after the deflection has been decided, so the sensitivity corresponds to the low pre-deflection voltage while the brightness corresponds to the high final voltage.

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