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Physics for Scientists and Engineers with Modern Physics
A 1.80 -m-tall person stands 3.80 $\mathrm{m}$ from a convex mirror and notices that he looks precisely half as tall as he does in a plane mirror placed at the same distance. What is the radius of curvature of the convex mirror? (Assume that $\sin \theta \approx \theta )$ IHint: The viewing angle is half.