In an optics experiment, with the position of the object fixed, a student varies the position of a convex lens and for each position; the screen is adjusted to get a clear image of the object. A graph between the object distance u and the image distance ν , 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° with the x-axis meets the experimental curve at P. The coordinates of P will be :
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For concave lens 

Straight line which is passing through origin cut at points (– 2f, 2f) but magnitude (+2f, +2f).
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