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Which 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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