Two thin lenses of focal lengths $f_{1} a n d f_{2}$ are in contact and coaxial. The power of the combination is :

\frac{f_{1} + f_{2}}{2}

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\frac{f_{1} + f_{2}}{f_{1} f_{2}}

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\sqrt{\frac{f_{1}}{f_{2}}}

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\sqrt{\frac{f_{2}}{f_{1}}}

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Solution

The correct option is B $\frac{f_{1} + f_{2}}{f_{1} f_{2}}$
$P = P_{1} + P_{2} = \frac{1}{f_{1}} + \frac{1}{f_{2}}$
$P = \frac{f_{1} + f_{2}}{f_{1} . f_{2}}$

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