If the near point of your eye is 80.0 cm, what power of reading glasses should you use to read from a book held 25.0 cm from your eye?

Question

Quizplus · Accepted Answer

The power of the lens needed is calculated using the lens formula: 1/f = 1/v - 1/u, where v is the near point distance (80 cm) and u is the reading distance (25 cm). Solving gives a focal length of approximately 36.36 cm, which corresponds to a lens power of +2.75 diopters.

If the near Point of Your Eye Is 80