A) \[6000\,\,{AA}\]
B) \[4200\,\,{AA}\]
C) \[3000\,\,{AA}\]
D) \[1800\,\,{AA}\]
Correct Answer: B
Solution :
Angular width \[\beta \]\[=\frac{2\lambda }{d}\] \[\Rightarrow \frac{{{\beta }_{1}}}{{{\beta }_{2}}}=\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}\Rightarrow \frac{\beta }{\frac{70}{100}\beta }=\frac{6000}{{{\lambda }_{2}}}\Rightarrow {{\lambda }_{2}}=4200\,{AA}\]
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