The human eye has a lens which has a

$A$ person has a near point at $60\; cm$. The focal length of the spectacle lenses required to read at $22\; cm$,with the glasses separated by $2\; cm$ from the eyes,is: (in $; cm$)

For a normal eye,the least distance of distinct vision is......$m$.

The image formed on the retina of the eye is proportional to:

The far point of a myopic eye is $250 \, cm$. What is the focal length of the lens required to correct this defect?

Match the List-$I$ with the List-$II$ from the combinations shown:

$(I)$ Presbyopia	$(A)$ Sphero-cylindrical lens
$(II)$ Hypermetropia	$(B)$ Convex lens of proper power may be used close to the eye
$(III)$ Astigmatism	$(C)$ Concave lens of suitable focal length
$(IV)$ Myopia	$(D)$ Bifocal lens of suitable focal length