A) 62°
B) 41°
C) 82°
D) 31°
Correct Answer: C
Solution :
By prism formula \[n=\frac{\sin \frac{A+A}{2}}{\sin \frac{A}{2}}=\frac{2\sin \frac{A}{2}\cos \frac{A}{2}}{\sin \frac{A}{2}}\] \[\therefore \] \[\cos \frac{A}{2}=\frac{n}{2}=\frac{1.5}{2}=0.75=\cos {{41}^{o}}\] Þ \[A={{82}^{o}}\]
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