You meet a person with prescription glasses of +0.55 dpt.

Question

What is the near point of this person? Express the result as a positive number!

Hint: the near point of a healthy person is 25 cm. An object placed at this distance will form an image at the near point of the person.

Answer 1

use the thin lens formula:

1/f=(1/p) + (1/q)

To find f: 1/f = 0.55dpt
p is 0.25m.
then find q, which is the near point.