Answer #50

The correct answer is C, turning on multi-focus. The ability to track the motion of an object over time is governed by temporal resolution or frame rate. Frame rate is 1/(time to scan one frame). Any measure that increases the time to scan one frame will reduce the frame rate and thus the temporal resolution. With multi-focus, to scan each line requires two pulses to different depths, so it will take longer to scan one frame. Similarly, scanning a wider and deeper sector takes more time and lowers frame rate. Lastly, the more dense the sector with lines to be scanned, the longer scanning one frame takes and thus the lower the frame rate.