Eyes: a Singer Is Farsighted and Cannot See Objects Clearly

Eyes: A singer is farsighted and cannot see objects clearly that are closer than 80.0 cm from his unaided eye. What is the refractive power of the contact lenses that will move his near point to a distance of 25.0 cm from his eye?

A) 2.75 diopters
B) - 2.75 diopters
C) - 4.72 diopters
D) 4.72 diopters
E) 7.00 diopters