Discussion
Consider the following statements about the cathode ray tube.
1. The grid controls brightness 2. Deflection is electrostatic in a general purpose instrument 3. The aquadag coating focuses the beam
Answer: B
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: the grid controls brightness, and a general purpose instrument deflects electrostatically - magnetic deflection belongs to television tubes, where large angles are needed. Statement 3 misattributes the aquadag: the conductive graphite coating collects the secondary electrons knocked off the screen and provides the final anode, while focusing is done by the electrostatic lens in the gun.
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