An object is positioned in front of a thin lens

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

An object is positioned 30 cm30\,\text{cm} in front of a thin lens. The lens produces a real image 60 cm60\,\text{cm} on the opposite side. What is the focal length of the lens? (a) −20 cm-20\,\text{cm} (b) 60 cm60\,\text{cm} (c) 20 cm20\,\text{cm} (d) 15 cm15\,\text{cm}

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