Eye related problems generally cured by glass or lenses. Similarly, hypermetropia or farsightedness can be corrected by using convex lens of appropriate power and myopia by concave lens of appropriate power.
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Eye related problems generally cured by glass or lenses. Similarly, hypermetropia or farsightedness can be corrected by using convex lens of appropriate power and myopia by concave lens of appropriate power.
[C] convex and concave lens