First slide

The lens

Question

Two thin lenses of focal lengths $f_{1} and f_{2}$ are in contact and coaxial. The combination is equivalent to a single lens of power

Moderate

A

$f_{1} + f_{2}$
B

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

$\frac{1}{2} (f_{1} + f_{2})$
D

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

Solution

$P = \frac{1}{F} = \frac{f_{1} + f_{2}}{f_{1} f_{2}}$

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