Physics

Problem

An object is located

12\,\text{cm}

in front of a thin lens. The lens forms a virtual, upright image that appears

18\,\text{cm}

from the lens on the same side as the object. Determine the focal length of the lens. a)

+7.2\,\text{cm}

+36\,\text{cm}

-36\,\text{cm}

+18\,\text{cm}