A converging lens of power $P_{1} = + 5 D$ and a concave mirror of power $P_{2} = + 16 D$ are placed at a separation of 80 cm such that their principal axis coincide. A point object is placed left side of the lens on its principal axes at a distance $X_{1}$ from the lens such that image of the object coincides will the object itself. When the mirror is further shifted right side by a distance $X_{2}$ , the image of the object further coincides with the object.

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