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← ScienceIn a Fabry-Pérot interferometer, which consequence results when mirror reflectivity increases?
A)Fringe sharpness and contrast increases✓
B)Transmitted intensity bandwidth widens
C)Resonance frequencies become unstable
D)Optimum cavity length increases linearly
💡 Explanation
Increased reflectivity causes multiple interfering reflections extending coherence within the cavity; this increases the effect of iterative constructive Interference, because sharper, higher contrast fringes result. Bandwidth narrows rather than widens with increased reflectance; cavity length optimum is stable.
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