Which lenses are used by people having shortsightedness?

A. Convex
B. Concave
C. Concavo-convex
D. Plain

Check Answer

The correct answer is B. Concave.
People with shortsightedness or myopia use concave lenses. Concave lenses are thinner in the middle and thicker at the edges, causing light to diverge as it passes through the lens. This helps to correct the vision of someone with myopia by allowing the light to spread out more before it enters the eye, which results in a clearer image being projected onto the retina. In contrast, convex lenses are thicker in the middle and thinner at the edges, causing light to converge as it passes through the lens, making them useful for correcting farsightedness or hyperopia. Concavo-convex lenses have both convex and concave surfaces and are used for a variety of applications, such as in eyeglasses, microscopes, and cameras. Plain lenses do not have any curvature and are not used for correcting vision.
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