Convex Mirror Focal Length · PhysicsBowl 2018 #29

Physics · optics

Problem

An object that is 8.60 cm tall is placed in front of a convex mirror. The resulting image is 7.60 cm tall, and 14.2 cm from the mirror. What is the focal length of the mirror? (A) -122 cm (B) -105 cm (C) 14.0 cm (D) -77.0 cm (E) -4.2 cm

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