Concave lens is used to correct

A concave lens, also called a diverging lens, is used to correct nearsightedness (myopia). The correct answer is [C] Nearsightedness. Nearsightedness is a common vision condition where distant objects appear blurry while close objects are seen clearly. This occurs because the eyeball is too long or the cornea is too curved, causing light rays to focus in front of the retina rather than directly on it. A concave lens diverges (spreads out) the incoming light rays before they reach the eye’s lens, allowing the focal point to be shifted back onto the retina. This correction enables individuals with myopia to see distant objects more clearly. Options A and D are incorrect because cataract is corrected through surgery, not with a concave lens, and long-sightedness (hypermetropia) is corrected with a convex lens. Option B, farsightedness (hyperopia), is corrected using a convex lens to converge light rays onto the retina for clear vision of near objects. Therefore, a concave lens specifically corrects nearsightedness (option C).