A) \[4780\overset{o}{\mathop{A}}\,\]
B) \[5760\overset{o}{\mathop{A}}\,\]
C) \[9720\,\overset{o}{\mathop{A}}\,\]
D) \[6390\overset{o}{\mathop{A}}\,\]
Correct Answer: A
Solution :
[a] \[{{\beta }_{1}}=\frac{2.30}{20}=\frac{D{{\lambda }_{1}}}{d}\] and \[{{\beta }_{2}}=\frac{2.80}{30}=\frac{D{{\lambda }_{2}}}{d}\] or\[\frac{{{\beta }_{1}}}{{{\beta }_{2}}}=\frac{2.30\times 30}{20\times 2.80}=\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}\] \[\therefore \,\,\,\,{{\lambda }_{2}}=0.81{{\lambda }_{1}}=0.81\times 5890=4780\overset{o}{\mathop{A}}\,\]
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