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A CRO uses _________

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A CRO uses _________

(a) Electromagnetic focusing

(b) Electrostatic focusing

(c) Both Electrostatic and Electromagnetic focusing

(d) No focusing technique

I have been asked this question during an interview.

Question is from Advanced Problems on CRT and CRO topic in chapter Oscilloscopes of Electrical Measurements

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The correct answer is (b) Electrostatic focusing

To elaborate: A Cathode Ray Oscilloscope always using the focusing technique for its operation. Electromagnetic focusing is used by the Cathode Ray Tube. However, the Cathode Ray Oscilloscope employs Electrostatic focusing.

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