A) 0.568
B) 0.760
C) 0.853
D) 0.672
Correct Answer: C
Solution :
[c] \[\Delta x=\lambda \,/\,8\] |
\[\therefore \] Phase difference \[\Rightarrow \,\,\Delta \phi =\frac{\pi }{4}\] |
\[l={{l}_{0}}{{\cos }^{2}}\left( \frac{\Delta \phi }{2} \right)={{l}_{0}}{{\cos }^{2}}\left( \frac{\pi }{8} \right)\] |
\[\therefore \,\,\,\,\,\,\,\,\frac{l}{{{l}_{0}}}=0.853\] |
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