A) \[{{18}^{o}}\]
B) \[{{36}^{o}}\]
C) \[{{54}^{o}}\]
D) \[{{72}^{o}}\]
Correct Answer: D
Solution :
From the given equation \[k=0.2\,\pi \] \[\Rightarrow \] \[\frac{2\pi }{\lambda }=0.2\pi \] \[\Rightarrow \] \[\lambda =10\,mm\] \[\Delta \phi =\frac{2\pi }{\lambda }\Delta x=\frac{2\pi }{10}\times 2=\frac{2\pi }{5}={{72}^{o}}\]
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