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#36564

equations

formulas

hard

90 sec

The thin lens equation relates the focal length $f$ of a lens to the object distance $d_{o}$ and the image distance $d_{i}$ : $\frac{1}{f} = \frac{1}{d _{o}} + \frac{1}{d _{i}}$ . Which equation correctly expresses $f$ in terms of $d_{o}$ and $d_{i}$ ?

A.

$f = d_{o} + d_{i}$

B.

$f = \frac{d _{o} d _{i}}{d _{o} + d _{i}}$

C.

$f = \frac{d _{o} + d _{i}}{d _{o} d _{i}}$

D.

$f = \frac{1}{d _{o} + d _{i}}$