In her job as a dental hygienist kathryn uses a concave, Ask an Expert

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In her job as a dental hygienist, Kathryn uses a concave mirror to see the back of her patient's teeth. When the mirror is 1.11 cm from a tooth, the image is upright and 3.13 times as large as the tooth. What are the focal length and radius of curvature of the mirror?

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