A concave lens of focal length f forms an image which is n times the size of the object. What are the distance of the object from the lens in terms of f and n?

Explanation

To solve the problem, we will use the lens formula and the magnification formula for a concave lens.

### Step-by-Step Solution:

1. **Understand the Lens Formula**: For a concave lens, the lens formula is given by:
\[ \frac{1}{v} - \frac{1}{u} = \frac{1}{f} \]
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