An object is placed 20 cm in front of a concave lens

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

Problem

An object is placed 20 cm in front of a concave lens. A virtual image is produced 10 cm from the lens on the same side as the object. According to the Cartesian sign convention, which set of signs for object distance u, image distance v and focal length f is correct? (a) u negative, v negative, f positiveu\ \text{negative},\ v\ \text{negative},\ f\ \text{positive} (b) u negative, v negative, f negativeu\ \text{negative},\ v\ \text{negative},\ f\ \text{negative} (c) u positive, v negative, f negativeu\ \text{positive},\ v\ \text{negative},\ f\ \text{negative} (d) u negative, v positive, f negativeu\ \text{negative},\ v\ \text{positive},\ f\ \text{negative}

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