The phase difference corresponding to path difference of $x$ is
The phase difference corresponding to path difference of $x$ is
- A
$\frac {2\pi x}{\lambda }$
- B
$\frac {2\pi \lambda }{x}$
- C
$\frac {\pi x }{\lambda }$
- D
$\frac {\pi \lambda }{x}$
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