A boy has been plying games in mobile phone and is suffering from eye defect the doctor prescribe him to use spectacles of power 5d what eye defect he suffering from
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since the power of the spectacle is 5D so the focal length is 20 CM. that means it is a convex lens. and a person use convex lens when he or she is suffering from hypermetropia.
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He is suffering from near sighted news and he needs convex lens
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