Since, the lens is diverging ,thus f is negative and f=−25cm
Formula for magnification is,
m=uv where, u,v are object and image distance respectively.
Thus, u=2v
Now, from lens maker formula,
f1=v1−u1 Hence,
−251=v1−2v1=2v1⟹v=−12.5cm Thus,
u=−25cm
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