Question

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

• A. $cL$
• B. $\frac{L}{c^-}$
• C. $\frac{c}{L}$
• D. $\frac{1}{L c}$

Answer 1

Answer: (B)

$\frac{L}{c^-}$

Answer 2

Coherent time = $\frac{\text{Coherence length}}{\text{Velocity of light}}$ $= \frac {L}{c}$