Question

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

(a) (2f, 2f)

(b) (f/2, f/2)

(c) (f, f)

(d) (4f, 4f)

Answer 1

(a) : According to New Cartesian coordinate system used in our 12th classes, for a convex lens, as