1. The problem statement, all variables and given/known data A nearsighted person has eyeglasses with a -1D prescription. If the near point is at 23 cm without eyeglasses, where is it when they are put on? 2. Relevant equations (1/f)=(1/do)+(1/di) 3. The attempt at a solution I got the answer which is 0.298701298 meters by -1= (1/do)-(1/0.23)...but the problem is that i don't know why it's like that...Any ideas would be extremely helpful!! Thanks!!