A convex lens of focal length f produces a real image 1n times than that of the size of the object. The distance of the object from the lens is

m=f(f+u)⇒−1n=f(f+u)⇒u=−(n+1)f

m=f(f+u)⇒−1n=f(f+u)⇒u=−(n+1)f

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A convex lens of focal length f produces a real image $\frac{1}{n}$ times than that of the size of the object. The distance of the object from the lens is

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$\frac{f}{n}$

$(n + 1) f$

$(n - 1) f$

answer is C.

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$m = \frac{f}{(f + u)} \Rightarrow - \frac{1}{n} = \frac{f}{(f + u)} \Rightarrow u = - (n + 1) f$

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