A) \[\frac{f\mu (\mu -1)}{(\mu -\mu )}\]
B) \[\frac{f(\mu -\mu )}{\mu (\mu -1)}\]
C) \[\frac{\mu (\mu -1)}{f(\mu -\mu )}\]
D) \[\frac{f\mu \mu }{\mu -\mu }\]
Correct Answer: A
Solution :
Using the relation \[\frac{1}{f}=\frac{\mu -1}{1}\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] ??.(1) \[\frac{1}{f}=\left( \frac{\mu -\mu }{\mu } \right)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] ?..(2) So, by equation (1) by (2) we get \[\frac{f}{f}=\frac{\mu -1}{1}\times \frac{\mu }{\mu -\mu }\] or \[f=\frac{f\mu (\mu -1)}{(\mu -\mu )}\]
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