John is nearsighted and cannot see things beyond 110 cm from his eyes. What is the focal length of the contact lenses that will enable him to see distant objects clearly?
A) +50 cm
B) -50 cm
C) -110 cm
D) +110 cm
E) -30 cm

Question

Quizplus · Accepted Answer

Nearsightedness means the person can see nearby objects clearly but not distant ones. The focal length of the lens needed is equal to the negative of the far point distance, which is -110 cm.

John Is Nearsighted and Cannot See Things Beyond 110 Cm