An object is kept at $15 c m$ from a convex mirror of focal length $25 c m$ . What is the magnification?

4 / 9

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5 / 8

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9 / 4

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8 / 5

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Solution

The correct option is B $5 / 8$
Magnification for a mirror, $m = \frac{f}{f - u}$
As per sign convention: $u = - 15 c m$ , $f = 25 c m$
So, $m = \frac{25}{25 + 15} = \frac{5}{8}$

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