The following graph depicts the inverse of magnification versus the distance between the object and lens data for a setup. The focal length of the lens used in the setup is Distance between the object and the lens m

Step-by-step solution

Magnification m = + 1 u From lens formula, 1 v - 1 u = 1 f ⇒ u v - 1 = u f ⇒ u v = u f + 1 ∴ graph between u v [inverse of magnification] and u will be straight line with slope 1 f From graph, slope = 250 ∴   f = 1 250   m = 0 . 004   m