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