A) \[\frac{f}{2}\]
B) f
C) \[\frac{3}{2}f\]
D) 2f
Correct Answer: D
Solution :
\[f=\frac{R}{2(\mu -1)}\], \[{f}'=\frac{R}{(\mu -1)}\] Þ \[{f}'=2f\]
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