Discussion
The flyback or retrace portion of the time base waveform is made as short as possible so that
Answer: D
Correct answer: little of the sweep time is wasted
The retrace carries no information, so any time spent on it is time the trace is not displaying the signal. Making the flyback a small fraction of the period keeps the duty cycle high and the trace bright and continuous. The beam is blanked during it in any case, so phosphor damage and trigger discrimination are not the concern.
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