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44. A near-sighted person cannot see distant objects because the image is focused in front of the retina. Which of the following optical instrument can correct this defect? A. convex lens B. concave lens C. sunglass D. magnifying glass
Concave lenses are used in eyeglasses that correct nearsightedness. Because the distance between the eye's lens and retina in nearsighted people is longer than it should be, such people are unable to make out distant objects clearly. Placing concave lenses in front of a nearsighted eye reduces the refraction of light and lengthens the focal length so that the image is formed on the retina.
Concave lens helps near-sighted people, eyeglasses is an example of an object with concave lens, this helps because they allow the light to reflect on the correct part of the retina.
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