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

A hypermetropic person whose near point is at 100 cm wants to read a book at 25 cm . Find the nature and power of the lens needed.

For glass lens f=+50 cm. Then power of lens is

A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?

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?

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?

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?

A persons near point is 50 cm and his far point is 3m. Powers of the lenses he requires for (i) reading and (ii) seeing distant stars are

A person's near point is 50 cm and his far point 3m . Power of the lenses he requires for (i) reading and (ii) for seeing distant stars are