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← ScienceWhich outcome occurs when excessive vibration perturbs laser mirrors?
A)Speckle pattern shifts erratically✓
B)Brewster angle becomes imaginary
C)Gain medium rapidly degrades
D)Laser facets experience total reflection
💡 Explanation
Speckle occurs due to interferences of coherent light scattering; motion introduces path length variations, and thus, speckle shifts because vibration modulates the interference pattern. Therefore speckle shifts rather than facet reflection changes or medium changes due to vibrations.
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