Question

Why is a concave lens used to correct myopia or short-sightedness? ​

Answer 1

Answer:

They spread the light out before it reaches the convexlens in the eye, therefore letting the image focus directly on the retina. 

Explanation:

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Answer 2

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Lenses used to correct nearsightedness are concave in shape. In other words, they are thinnest at the center and thicker at the edge. These lenses are called "minus power lenses" (or "minus lenses") because they reduce the focusing power of the eye.