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An object is placed at A(OA>f) Here, f is the focal length of the lens. The image is formed at B, A perpendicular is erected at 0 and C is chooses such that BCA=90. Let OA=a,OB=b and OC=c then f is :

 

(a)c2a2+b2+c2(b)ca+b(c)c2a+b(d)None

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