A) \[2000\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[4000\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[8000\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1200\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
From Hygen's wave theory, we have \[_{1}{{n}_{2}}=\frac{{{v}_{1}}(speed\text{ }of\text{ }light\text{ }in\text{ }air)}{{{v}_{2}}(speed\text{ }of\text{ }light\text{ }in\text{ }glass)}=\frac{{{\lambda }_{a}}}{{{\lambda }_{g}}}\] \[1.5=\frac{6000}{{{\lambda }_{g}}}\] \[\Rightarrow \] \[{{\lambda }_{g}}=\frac{6000}{1.5}=4000\overset{\text{o}}{\mathop{\text{A}}}\,\]
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