- #1
jeahomgrajan
- 49
- 0
Homework Statement
A person with presbyopia can see distant objects clearly, but is unable to accomadate to see near objects because of hardening lens. one person cannot see objects nearer than 1.5m.
a)the focal length of the eye glasses needed to see objects as close as 25cm.
Homework Equations
the answer is 30cm
The Attempt at a Solution
i know you got to use the formula 1/f=1/do + 1/di
(i just don't understand the ?)