A) 0.12 mm
B) 0.3 mm
C) 3.0 mm
D) 4.0 mm
Correct Answer: B
Solution :
\[\beta =\frac{\lambda D}{d}=\frac{6000\times {{10}^{-10}}\times 2}{4\times {{10}^{-3}}}=3\times {{10}^{4}}m=0.3\ mm\]
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