Question

A_______ lens is used to correct myopia and a ______ lens is used to correct Hypermetropia.
(A). concave, convex
(B). convex, convex
(C). convex, concave
(D). concave, convex

Answer 1

When light rays pass through a lens, they undergo refraction as light goes from air into the medium of lens. Sometimes when the eye lens becomes weak, it can combine with different lenses to correct eye conditions. Myopia is a condition in which nearby objects are not clear while in Hypermetropia, the faraway objects are not clear.

Complete answer:
Myopia, also called long sightedness, is a condition in which a person cannot see nearby objects clearly but can see faraway objects clearly. The image of nearby objects is hazy because it is not formed on the retina but behind the retina.
In order to correct myopia, we need a converging lens which can focus the light rays on the retina. A convex lens is a converging lens and it is used to correct myopia.

Hypermetropia, also called near-sightedness is a condition in which a person cannot see faraway objects clearly but can see nearby objects clearly. The image of faraway objects is formed in front of the retina and not on the retina itself due to which the image is hazy and unclear.
In order to correct Hypermetropia, we need a diverging lens which can focus the light rays on retina. A concave les is a diverging lens and it is used to correct Hypermetropia.

Therefore, a convex lens is used to correct myopia and a concave lens is used to correct

Hence, the correct option is (C).

Note:
Retina is similar to a screen present in the eye where images are formed and then signals are transmitted to the brain. The eye lens is made to combine with a lens to correct conditions like myopia and Hypermetropia. The muscles in the eye are responsible for adjusting the eye lens such that image is formed on the retina.