A) 2 : 3
B) 3 : 4
C) 2 : 1
D) 1 : 2
Correct Answer: D
Solution :
[d] | |
\[\frac{1}{{{F}_{1}}}=\frac{1}{f}+\frac{1}{f}\] | |
| |
\[\frac{1}{{{F}_{1}}}=\frac{1}{f}\left( -\frac{1}{f} \right)+\frac{1}{f}\] | |
\[\frac{1}{{{F}_{2}}}=\frac{1}{f}\] | |
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