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Which outcome occurs when path length differences exceed coherence?

A)Interference fringes become blurred
B)Laser emits in pulsed mode
C)Material experiences higher refractive index
D)Gain medium becomes strongly saturated

💡 Explanation

When path length differences exceed the coherence length, the interference signal washes out because the interfering waves are no longer correlated; therefore the fringes blur, rather than pulsing due to modal effects. The mechanism responsible is wave superposition.

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