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The focal length of a concave mirror is f . An object is placed at a distance x from the focus. The magnification is

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f/x

f+x)/f

f/(f +x)

x/f

answer is B.

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Detailed Solution

u=f+x
Using mirror formula,
$\begin{array}{l} 1 / v + 1 / u = 1 / f \\ Or, 1 / v - 1 / (f + x) = - 1 / f \\ ∴ v = - f (f + x) / x \end{array}$
So, the magnification $= | m | = v / u = f / x$

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