Which type of lens is used to correct myopia (short-sightedness)?
Answer and explanation
Correct answer: B. Concave lens
- Step 1: In myopia (short-sightedness), light rays from distant objects are focused in front of the retina rather than directly onto it, caused by excessive curvature of the eye lens or elongation of the eyeball.
- Step 2: A concave (diverging) lens is placed before the eye to diverge incoming parallel light rays, shifting the focal point backward so that the image forms sharply on the retina.
Answer
Concave lens.
Why not the others: Convex lenses correct hypermetropia; cylindrical lenses correct astigmatism; and bifocal lenses correct presbyopia.
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