Question

For the two coherent sources emitting the light of wavelength $5\text{nm}$, what is the value of phase difference for the path difference $5\text{nm}$?

• A. $4\pi$
• B. $3\pi$
• C. $\pi$
• D. $2\pi$

Answer 1

The correct option is D $2\pi$

We know that, phase difference,

$\Delta \varphi =\frac{2\pi }{\lambda }\times \Delta x$

$\Rightarrow \Delta \varphi =\frac{2\pi }{5\times {10}^{-9}}\times 5\times {10}^{-9}=2\pi$

So, option $\left(D\right)$ is the right answer.