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← ScienceWhich outcome diminishes when telescope objectives lose coherence?
A)Fringe visibility sharply declines✓
B)Astigmatism correction becomes unstable
C)Chromatic aberration range increases
D)Spherical aberration errors nullify
💡 Explanation
Loss of coherence impairs **constructive interference**, creating blurred fringes; because fringe visibility relies on wave alignment, it weakens significantly. Therefore, fringe degradation increases, rather than other aberration types, due to diminished superposition effects.
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