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:

f₁f₂/f₁-f₂

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√f₁f₂

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f₁f₂/f₁+f₂

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f₁+f₂/2

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Solution

The correct option is C
f₁f₂/f₁+f₂

The power of a lens is defined as the reciprocal of its focal length.

Total Power = $P_{1}$ + $P_{2}$

$\frac{1}{f}$ = $\frac{1}{f_{1}}$ + $\frac{1}{f_{2}}$

f = $\frac{f_{1} f_{2}}{f_{1} + f_{2}}$

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Similar questions

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}

f_{2}

f_{1} a n d f_{2}

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

Δ

f_{1}

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