A) \[30{}^\circ \]
B) \[60{}^\circ \]
C) \[90{}^\circ \]
D) \[120{}^\circ \]
Correct Answer: A
Solution :
\[\left| \!{\nderline {\, r \,}} \right. ={{30}^{o}}(\because \,\angle i=\angle r)\]
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