**Let AB represent an object placed at right angles to the principal axis at a distance greater than the focal length f of the convex lens. The image A**^{1}B^{1}is formed beyond 2F_{2}and is real and inverted.

**OA = Object distance = u**

**OA**^{1}= Image distance = v

**OF**_{2}= Focal length = f

**OAB and OA**^{1}B^{1}are similar

**But we know that OC = AB**

**the above equation can be written as**

**From equation (1) and (2), we get**

**Dividing equation (3) throughout by uvf**

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