A nearsighted person cannot clearly see past 200 cm . Determine the power of the lens required for the person to view objects at large distances.

Step-by-step solution

For a nearsighted (myopic) eye, the lens must form an image of an object at infinity at the far point of the eye. Given the far point is 200 cm , the image distance is v = -200 cm = -2 m . The object distance is u = - . Using the lens formula: 1 f = 1 v - 1 u 1 f = 1 -2 - 1 - 1 f = -0.5 m ⁻¹ The power of the lens is P = 1 f = -0.5 D .