A) \[5000\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[6000\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[7000\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[8000\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
Fringe width \[{{X}_{n}}=\frac{n\lambda D}{2d}\] \[\lambda =\frac{{{X}_{n}}\times 2d}{nD}\] \[=\frac{5\times {{10}^{-3}}\times 1\times {{10}^{-3}}}{10\times 1}=5000\overset{\text{o}}{\mathop{\text{A}}}\,\]
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