A) \[6000\,\,{AA}\]
B) \[4000\,\,{AA}\]
C) \[1200\,\,{AA}\]
D) \[2400\,\,{AA}\]
Correct Answer: A
Solution :
\[\beta =\frac{\lambda \,D}{d}\Rightarrow (0.06\times {{10}^{-2}})=\frac{\lambda \times 1}{1\times {{10}^{-3}}}\] \[\Rightarrow \lambda =6000\,{AA}\]
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