The near point of a person is 75 cm. In order that he may be able to read book at a distance 30 cm. The power of spectacles lenses should be

A person whose far-point is at 30cm wants to read at 50cm . The power of the lens should be

The near point of a hypermetropic eye is 50 cm . Calculate the power of the lens to enable him to read a book at 40 cm ?

The near point of a person is 50 cm and the far point is 1.5m . The spectacles required for reading purpose and for seeing distant objects are respectively

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 person is unable to see objects nearer than 50 cm. He wants to read a book placed at a distance of 25 cm. Find the nature, focal length and power of the lens he requires for his spectacles.

The near and far points of a person are at 40 cm and 250cm respectively. Find the power of the lens he/she should use while reading at 25cm . With this lens on the eye, what maximum distance is clearly visible?