Two thin lenses of focal lengths \( f_{1} \) and \( f_{2} \) are in...

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Two thin lenses of focal lengths \( f_{1} \) and \( f_{2} \) are in contact and coaxial. The power of combination is:
\( \mathrm{P} \)
(1) \( \sqrt{\frac{f_{1}}{f_{2}}} \)
(2) \( \sqrt{\frac{f_{2}}{f_{1}}} \)
W
(3) \( \frac{f_{1}+f_{2}}{f_{1}} \)
(4) \( \frac{f_{1}+f_{2}}{f_{1} f_{2}} \)
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