Question

What type of lens is used to correct (a) hypermetropia (b) myopia?

Answer 1

Hint:If the eye has myopia then the eye will become too long and the image falls short of the retina. And in hypermetropia the eye is shorter than in the normal case and the image focuses behind the retina.

Complete step by step answer:
Given in the question to tell the type of lens is used to correct hypermetropia and myopia.
So, first understand these terms.
Hypermetropia is the condition when the eye is shorter than the normal condition and the image focuses behind the retina if the target object is near. This implies that it doesn’t focus even when it reaches the retina.
Myopia is the condition when the eye is too long than the normal condition and the image falls short of the retina when the target object is far away.
So, we can say that a convex lens should be used for hypermetropia and a concave lens for myopia.

Note:As mentioned in the solution, that the convex lens should be used for hypermetropia and a concave lens is used for myopia, as a convex lens is a converging lens that focuses the light rays to a specific point and the concave lens diverges the light rays. So, by using these two lenses the two abnormalities can be cured.