A shiny spoon provides both a concave mirror and a convex mirror, one on each side.
Assume the height of the head is about 22 cm and the height of the image of the head is 2.0 cm, considering that the image size is approximately equal to the size of a spoon. Using these estimates, determine the magnification.
Use equations f = R/2 (focal length of a spherical mirror) and 1/s + 1/s' = 1/f (object-image relationship, spherical mirror) to estimate the radius of curvature of the spoon.
Express your answer with the appropriate units.