A) 0.1 mm
B) 1 cm
C) 0.1 cm
D) 1 m
Correct Answer: D
Solution :
\[\beta =\frac{\lambda \,D}{d}\Rightarrow (4\times {{10}^{-3}})=\frac{4\times {{10}^{-7}}\times D}{0.1\times {{10}^{-3}}}\Rightarrow D=1\,m\]
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