3.
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 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° with the x-axis meets the experimental
curve at P. The coordinates of P will be