A far sighted person has a near point of 60 cm. What power lens should be used for eye glasses such that the person can read a book at a distance of 25 cm.

Explanation

it is given that his far sight is good beyond 60 cm
His near sight is bad . If the desired to read book at u `=-25 cm` then for good vision image distance should be at a distance of 60 cm or more . For minimum power lens .
`v=- 60 cm u =-25 cm`