answer the question no 1...
and when do we get +
positive dioptre or negative dioptre!!...
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name of defect - myopia.
positive dioptre is taken for convex lens i.e a person having hypermetropia and negative when concave lens i.e person is suffering from myopia
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positive dioptre is taken for convex lens i.e a person having hypermetropia and negative when concave lens i.e person is suffering from myopia
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