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What is the role of astigmatism in a CRO?

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What is the role of astigmatism in a CRO?

(a) increases the intensity

(b) used for voltage stability

(c) diminishes the intensity

(d) focus control

The question was asked during an interview.

Origin of the question is Front Panel Controls of CRO topic in division Oscilloscopes of Electrical Measurements

1 Answer

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Best answer
Correct choice is (d) focus control

The best I can explain: In a Cathode Ray Oscilloscope the astigmatism forms another set of focus control. A sharp spot can be obtained by the combination of focus control and astigmatism.

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