A) \[60{}^\circ \]
B) \[45{}^\circ \]
C) \[90{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: A
Solution :
For minimum deviation, i =e \[{{r}_{1}}={{r}_{2}}=\frac{A}{2}=\frac{{{60}^{o}}}{2}={{30}^{o}}\] Using snell?s law at the interface, \[1\sin i=\sqrt{3}\sin {{r}_{1}}\] \[\sin i=\sqrt{3}\sin {{30}^{o}}=\sqrt{3}/2\] \[i={{60}^{o}}\].
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