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What is the role of the intensity section in a CRO?

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What is the role of the intensity section in a CRO?

(a) decreases the light intensity

(b) controls light intensity

(c) increases the light intensity

(d) keeps the light intensity zero

This question was posed to me in an interview.

This key question is from Front Panel Controls of CRO in chapter Oscilloscopes of Electrical Measurements

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Right option is (b) controls light intensity

To elaborate: In a Cathode Ray Oscilloscope the intensity section controls the brightness or intensity of the light beam produced by the bombardment of electrons on the fluorescent screen.

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