a person needs a lens of power minus 4.5 diopter what is defect what is focal length and nature of lens
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The defect is Myopia. Whenever prescribed lens has a negative power, it is a concave lens, for myopia.
As it is a concave lens, it is a diverging lens.
Focal length = 1/Power
=> focal length = 1/4.5
=> f = 10/45
=> f = 2/9
Therefore, focal length is 2/9 (or) 0.22 m
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