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) $\frac{1}{Lc}$

Answer 1

Answer:

The coherent time is $\dfrac{L}{c}$.

(b) is correct option.

Explanation:

Given that,

Coherence length = L

Velocity of light = c

We need to calculate the coherent time

Using formula of coherent time

$coherent\ time = \dfrac{Coherence\ length}{Velocity\ of\ light}$

Put the value into the formula

$coherent\ time =\dfrac{L}{c}$

The coherent time is the ratio of coherence length and velocity of light.

Hence, The coherent time is $\dfrac{L}{c}$.