For a short-sighted person,the image is formed at

Myopia is due to

When the power of the eye lens increases,a defect of vision is produced. This defect is known as:

$A$ person can see clearly only up to a distance of $25 \, cm$. He wants to read a book placed at a distance of $50 \, cm$. What kind of lens does he require for his spectacles and what must be its power?

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

If the least distance of distinct vision for a boy is $35 \ cm$,then the lens to be used by the boy for correcting the defect of his eye is