Myopia is a defect of the eye due to which a person experiences difficulty in seeing .......

The lens used to correct long-sightedness (hypermetropia) is:

An imaginary line joining the optical centre of the eye lens and the yellow point is called as

The least distance of distinct vision for a farsighted person is $1 \ m$. The optical power of the lens of his spectacles,which effectively reduces his least distance of distinct vision $(LDDV)$ to $25 \ cm$,is:

The near point and far point of a normal human eye are respectively:

$A$ man cannot see clearly the objects beyond a distance of $20 \, cm$ from his eyes. To see distant objects clearly,he must use which kind of lenses and of what focal length?