An object is positioned 18 cm in front of a thin lens

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

An object is positioned 18 cm in front of a thin lens. A sharp, inverted image is formed on a screen 27 cm on the opposite side of the lens. Calculate the focal length of the lens, including the proper sign.

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