Answer
See explanation.
Work Step by Step
a. The person is farsighted.
b. A converging lens is needed.
c. Use the lens equation.
$$\frac{1}{s}+\frac{1}{s’}=\frac{1}{f}$$
$$\frac{1}{25.0cm}+\frac{1}{-45.0cm}=\frac{1}{f}$$
$$f=56.25cm$$
$$P=\frac{1}{f}=\frac{1}{0.5625m}=1.78D$$
