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Calculate the distance of an object of height `h` from a concave mirror of focal length `10 cm` so as to obtain a real image of magnification `2`.

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Correct Answer - `- 15 cm`
Here, `u = ?, f = - 10 cm, m = -2`
As `m = (f)/(f - u) :. -2 = (- 10)/(-10 - u) = (10)/(10 + u)`
`10 = - 20 - 2u`
`2u = -30, u = - 15 cm`

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