Two thin lenses of focal length $f_{1}$ and $f_{2}$ are in contact and coaxial. The power of the combination is

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

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

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

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\frac{f_{1} - f_{2}}{f_{1} f_{2}}

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Solution

The correct option is B $\frac{f_{1} + f_{2}}{f_{1} f_{2}}$
For the lenses placed coaxially,
We have the relationship $P = P_{1} + P_{2} + P_{3} + . . . . . .$
So,for given case P= $P_{1} + P_{2}$ or $P$ = $\frac{1}{f_{1}}$ + $\frac{1}{f_{2}}$

So,C is the correct answer.

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Similar questions

Two thin lenses of focal lengths $f_{1}$ and $f_{2}$ are placed in contact with each other. The focal length of the combination will be given by:

If two thin lenses of focal length f₁ and f₂ are held in contact then the focal length of the combination will be

f_{1}

f_{2}

f_{1} a n d f_{2}

d < f_{1}, d < f_{2}

Δ

f_{1}

f_{2}

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