A) \[3600\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[4000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[5000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[4500\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
E) \[5500\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
\[x=\frac{mD{{\lambda }_{1}}}{d}=\frac{(m+1)D{{\lambda }_{2}}}{d}\] \[\Rightarrow \]\[3\times 6000=4{{\lambda }_{2}}\] Or \[{{\lambda }_{2}}=\frac{3\times 6000}{4}=4500{\AA}\]
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