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Cartesian Sign Convention for Spherical Mirrors and Lenses
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Magnification produced by a convex mirror is $\frac { 1 }{ 3 }$, then distance of the object from mirror is
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A
$2f$
💡 Explanation:
Magnification m = -v/u = 1/3 for a convex mirror. Using the mirror formula 1/v + 1/u = 1/f, we substitute v = -u/3. This gives -3/u + 1/u = 1/f, leading to -2/u = 1/f, so u = -2f. The distance is 2f.