Object distance from a convex lens forming a real image n times (twice) the object size

1. A.
   0.5 f
2. B.
   0.66 f
3. C.
   f
4. D.
   1.5 f

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1. A.
   $\frac{n+1}{n}f$
2. B.
   $f\left(1-\frac{1}{n}\right)$
3. C.
   $\frac{nf}{n+1}$
4. D.
   $f\left(1+\frac{1}{n}\right)$

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1. A.
   0.5 m
2. B.
   0 .166 m
3. C.
   0.33 m
4. D.
   1 m

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