A) \[3300\overset{o}{\mathop{A}}\,\]
B) \[6600\overset{o}{\mathop{A}}\,\]
C) \[2062\overset{o}{\mathop{A}}\,\]
D) \[5500\overset{o}{\mathop{A}}\,\]
Correct Answer: D
Solution :
[d] The path difference produced by a sheet \[\Delta =(\mu -1)t\] According to the given condition (for minimum thickness) \[(\mu -1)t=\frac{\lambda }{2}\] \[\therefore \,\,\,t=\frac{\lambda }{2(\mu -1)}=\frac{6600\times {{10}^{-10}}}{2(1.6-1)}=5500\overset{o}{\mathop{A}}\,\]
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