Q.To remove hypermetropia, lens used is (A) convex
(B) concave
(C) cylindrical
(D) plano-convex

Hypermetropia is corrected with a convex (converging) lens that brings the image forward onto the retina.

In hypermetropia (far-sightedness) the eye's converging power is too weak or the eyeball too short, so the image of a nearby object forms behind the retina. A convex (converging) lens adds the needed extra convergence, moving the image forw …

Myopia is corrected with a concave lens, hypermetropia with a convex lens, presbyopia with a bifocal lens, and astigmatism with a cylindrical lens.

• (A) Myopia (near-sightedness): the eyeball is too long / eye lens too converging, so distant objects focus in front of the retina. Corrected with a diverging (concave) lens $\to$ (3).
• (B) Hypermetropia (far-sightedness): the eyeball is too short / eye lens too weak, so near objects focus behind the retina. Corrected with a converging (convex) lens $\to$ (4). …