# 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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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