Chapter 25 - Vision and Optical Instruments - Learning Path Questions and Exercises - Exercises - Page 871: 12

The far point of the man is $-0.25m$

Object distance = $do=infinity$ Given that the man has nearsightedness and he wears lenses of focal length $-0.25m$ $\frac{1}{f}=\frac{1}{do}+\frac{1}{di}$ $\frac{1}{-0.25}=\frac{1}{infinity}+\frac{1}{di}$ $di=-0.25m$