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Homework Statement
A dentist uses a curved mirror to view teeth on the upper side of the mouth. Suppose she wants an erect image with a magnification of 2.00 when the mirror is 1.25 cm from a tooth. (Treat this problem as though the object and image lie along a straight line.) What kind of mirror (concave or convex) is needed? Use a ray diagram to decide, without performing any calculations.
Homework Equations
The Attempt at a Solution
If object distance is less than focal length for a concave mirror, the image will be upright. But I'm not given focal length, so how am I supposed to know it's a concave mirror?