If L is the coherence length and c the velocity of light, the coherent time is

(1) cL

(2) $\frac{L}{c}$

(3) $\frac{c}{L}$

(4) $\frac{1}{Lc}$

(2) Coherent time $=\frac{Coherence\text{\hspace{0.17em}}length}{Velocity\text{\hspace{0.17em}}of\text{\hspace{0.17em}}light}=\frac{L}{c}$

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