Final answer:
The object should be placed 10 cm away from the lens to produce an image at the same distance. The magnification formula can be used to calculate the magnification produced by the lens.
Explanation:
The object should be placed 10 cm away from the lens in order to produce an image at a distance of 10 cm from the lens. The formula for magnification created by a lens is given by magnification (m) = -v/u, where v is the image distance and u is the object distance. By substituting the given values, you can calculate the magnification produced by the lens.
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