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An object is placed at `A(OA gt f)`. Here, f is the focal length of the lens. The image is formed at B. A perpendicular is erected at O and C is chosen such that `/_BCA = 90^(@)`. Let OA = a, OB = b and OC = c. Then the value of f is
A. `((a+b)^(3))/(c^(2))`
B. `((a+b)c)/((a+c))`
C. `(c^(2))/(a+b)`
D. `(a^(2))/(a+b+c)`

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