# 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 chose

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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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