PH-1738

Converging lenses

Physics · Secondary 4 · Medium · Converging lenses

A converging lens forms a real image of an object placed 12 cm from the lens. The image is formed 18 cm on the other side of the lens. Using the lens formula

\frac{1}{f} = \frac{1}{u} + \frac{1}{v}

, what is the focal length

f

of the lens?

$7.2\,\text{cm}$
$5.0\,\text{cm}$
$10.0\,\text{cm}$
$30.0\,\text{cm}$

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