Question

what kind of lens is used who cannot see near objet

Answer 1

Answer:  Concave lenses are used here. They spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina.

Answer 2

Answer:

The nature of lens required to see the distant objects clearly is convex lens is power.

We are able to see distant and nearby objects clearly by changing the focal length of the eye lens. This is called accommodation of the eye.

Convex lenses are used in eyeglasses for correcting farsightedness, where the distance between the eye's lens and retina is too short, as a result of which the focal point lies behind the retina. Eyeglasses with convex lenses increase refraction, and accordingly reduce the focal length.

Hope it helps