Magnification produced by a convex mirror is 1/3 then the distsnce of the object from mirror is
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m=1/3
We know, m= -v/u
Therefore, -v/u = 1/3
v = -u/3
Substituting the value of 'v' in the mirror formula, we get u= -2f.
(where, ' - 'indicates that the object is in front of the mirror).
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