The eye of a farsighted person has a near point of 90cm. Objects nearer than 90cm cannot be seen clearly. A converging lens is used to correct the vision of a book placed 25cm from the eye. Find the focal length of this lens.

The eye of a farsighted person has a near point of 90cm. Objects neare

1.	The eye of a farsighted person has a near point of 90cm. Objects nearer than 90cm cannot be seen clearly. A converging lens is used to correct the vision of a book placed 25cm from the eye. Find the focal length of this lens.
Answer» `+40CM` `-40cm` `-34.6cm` `+34.6cm` ANSWER :D