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← ScienceWhich operational problem arises when multiple lasers, intended for optical interferometry, lack temporal coherence?
A)Increased speckle and fringe blurring✓
B)Catastrophic optical feedback resonance
C)Increased overall beam intensity
D)Reduced sensitivity to vibrations
💡 Explanation
Temporal coherence guarantees a stable interference pattern; lacking it causes rapidly shifting fringes due to differing wavelengths affecting interference. Therefore, blurring increases rather than feedback because coherence is already poor and shifts, rather than creating resonance.
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