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← ScienceWhich outcome occurs from decreased temporal coherence in laser rangefinders?
A)Reduced maximum unambiguous measurable distance✓
B)Increased signal-to-noise floor ratio
C)Improved precision scanning speed
D)Expanded beam spatial mode symmetry
💡 Explanation
Decreased temporal coherence in a laser decreases the coherence length; ranging precision degrades because the correlation between the emitted and received signals diminishes quickly reducing maximum measurable unambiguous distances. Therefore, range is lessened, rather than increased signal or other changes occurring.
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