-- card: 86584 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #277
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on openCard
  global group,rightone
  put 28 into group
  put "D" into rightone
  pass openCard
end openCard



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Question #28

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4BF-6.2 How is the electron beam deflected in a "vidicon"?

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By varying the beam voltage

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By  varying the bias voltage on the beam forming grids inside the tube

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By varying the beam current

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By varying electromagnetic fields

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Correct answer is D