In a optics experiment, with the positive of the object fixed, a student varies the positive of a convex lens and for each positive, the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance v, from the lens, is plotted using the same scale for the two axes. A straight line passing through the origin and making an angle of ${45}^{\circ }$ with the x-axis meets the experimental curve at P. The coordinates of P will be

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