Physics Optics Refraction and Reflection

The focal length of a convex lens is f. It makes virtual image of size n times the size of the object. The distance of the object from the lens is :

1
\(\left(\dfrac{n-1}{n}\right)f\)
2
(n + 1) f
3
(n - 1) f
4
\(\left(\dfrac{n+1}{n}\right)f\)

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