Nooper needs a lens of power - 4.5 D for...

Nooper needs a lens of power `- 4.5 D` for correction of her vision.
(a) What kind of defect in vision is she suffering from ?
(b) What is the focal length and nature of corrective lens ?
( c) Draw ray diagrams showing the defected eye and correction for the defect.
(d) What are the causes of this defect ?

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