The distance of distinct vision of a person is `50 cm`. He wants to read a book placed at `25 cm`. What should be the focal length of the spectacles ?

A long sighted person has a least distance of distinct vision of 50 cm. He wants to reduce to 25 cm. He should use a

A certain person has a "minimum distance of distinct vision of "150cm" . He wishes to read at a distance of "25cm" .What " focal length glasses should he use?

The least distance of distinct vision of a person is 75 cm. The focal length of the reading spectacles for such a person should be

A longsighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a

A longsighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a

A certain person has a minimum distance of distinct vision of 150cm. He wishes to read at a distance of 25cm. What focal length glasses should he use?

A person who can see things most clearly at a distance of 10 cm , requires spectacles to be able to see clearly things at a distance of 30 cm . What should be the focal length of the spectacles ?

The least distance of distance vision of a person is 75 cm. The focal length of the reading spectacles for such a person should be