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Cartesian Sign Convention for Spherical Mirrors and Lenses

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Multiple Choice

Magnification produced by a convex mirror is $\frac { 1 }{ 3 }$, then distance of the object from mirror is

  1. $\frac { f }{ 3 }$
  2. $\frac { 2f }{ 3 }$
  3. $1f$
  4. $2f$
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