A wire mesh consisting of very small squares is viewed at a distance of 8 ~cm through a magnifying converging lens of focal length 10 ~cm , kept close to the eye. The magnification produced by the lens is

Step-by-step solution

u=-8 ~cm , f=10 ~cm As, 1 v - 1 u = 1 f , 1 v = 1 f + 1 u = 1 10 + 1 -8 = 1 10 - 1 8 = 4-5 40 = -1 40 or, v=-40 ~cm . Magnification produced by the lens, m= v u = -40 -8 =5 . This is a virtual image, erect and on the same side as the object.