A) 0.024 cm
B) 2.4 cm
C) 0.24 cm
D) 0.2 cm
Correct Answer: D
Solution :
\[\beta =\frac{\lambda D}{d}\]\[\Rightarrow d=\frac{\lambda D}{\beta }\]\[=\frac{6000\times {{10}^{-10}}\times (40\times {{10}^{-2}})}{0.012\times {{10}^{-2}}}=0.2\,cm.\]
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