A) \[4.068\,\times {{10}^{8}}\]
B) \[4.068\,\times {{10}^{4}}\]
C) \[4.068\,\times {{10}^{6}}\]
D) \[4.068\,\times {{10}^{5}}\]
Correct Answer: B
Solution :
Number of oscillations in coherence length \[{{C}_{1}}=C,\,{{C}_{2}}=2C\,,\,{{C}_{3}}=3C\] \[{{C}_{4}}=4C\]
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