A) \[{{f}_{1}}-{{f}_{2}}\]
B) \[\frac{R}{{{\mu }_{2}}-{{\mu }_{1}}}\]
C) \[\frac{2{{f}_{1}}{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}\]
D) \[{{f}_{1}}+{{f}_{2}}\]
Correct Answer: B
Solution :
\[\frac{1}{F}-\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}-\frac{1-{{\mu }_{1}}}{R}+\frac{{{\mu }_{2}}-1}{R}\] |
\[\frac{1}{F}=\frac{1-{{\mu }_{1}}+{{\mu }_{2}}-1}{R}\] |
\[\frac{1}{F}=\frac{{{\mu }_{2}}-{{\mu }_{1}}}{R}\] |
\[F=\frac{R}{{{\mu }_{2}}-{{\mu }_{1}}}\] |
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