The relation between phase difference $(\Delta \phi)$ and path difference $(\Delta x)$ is:
- A$\Delta \phi = \frac{2\pi}{\lambda} \Delta x$
- B$\Delta \phi = 2\pi \lambda \Delta x$
- C$\Delta \phi = \frac{2\pi \lambda}{\Delta x}$
- D$\Delta \phi = \frac{2 \Delta x}{\lambda}$
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