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An object O is placed in front of a smal...

An object O is placed in front of a small plane mirror `M_(1)` and a large convex mirror `M_(2)` of focal length f. The distance between O and `M_(1)` is x and the distance between `M_(1)` and `M_(2)` is y. The images of O formed by `M_(1)` and `M_(2)` coincide. The magnitude of f is

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