A) \[60{}^\circ \]
B) \[45{}^\circ \]
C) \[30{}^\circ \]
D) \[15{}^\circ \]
Correct Answer: C
Solution :
The critical angle C is given by \[\sin C=\frac{{{n}_{2}}}{{{n}_{1}}}=\frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}=\frac{3500}{7000}=\frac{1}{2}\] Þ \[C={{30}^{o}}\]
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