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

$A$ person uses spectacles of power $+2D$. He is suffering from

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

The ability of the eye to see objects at all distances is called

$A$ 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?

The near point of a person is $75 \, cm$. In order for him to be able to read a book at a distance of $30 \, cm$,what should be the power of the spectacle lenses?