An old person has near point 100 cm. find the power of the corrective lens he will have to use?

A certain myopic person has a far point of 150 cm. What power of a corrective lens must have to allow him to see distant objects clearly ?

A farsighted person has a near point of 75 cm for one eye and a near point of 100 cm for the other .What pwers should corrective lenses have to allow the person to see an object clearly at a distance of 25cm.

A certain nearsighted person cannot see objects clearly,when they are more than 78 cm from either eye. The person's near pint is 23 cm.How is this affected,when viewing through the corrective lenses?Assume that the lenses in spectales are 3 cm in front of the eye.

The near point of a hypermetropia eye is 1 m find the power of the lens required to correct this defect . Assume that near point of the normal eye is 25 cm

Ram’s near point is 50 cm. Find the nature and power of lens which would enable him to read a book placed at 25 cm from his eyes.