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A person needs a lens of power -4.5 D for correction of her vision (i)what kind of vision she ia suffering from.

(ii) focal length of corrective lensm
(iii)natureof corrective lensm


1.She is suffering from myopia 2.Focal lenght of corrective lens is -0.22... i.e -0.23 3.corrective lens is concave lens
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