A convex lens 'L' and a plane mirror 'M' are arranged as shown in figure below. Position of object pin 'O' is adjusted in such a

Question

A convex lens 'L' and a plane mirror 'M' are arranged as shown in figure below. Position of object pin 'O' is adjusted in such a way that the inverted image 'I' formed by the lens mirror combination, coincides with the object pin 'O'. Explain how and when this happens :

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