Question

Noopur needs a lens of -4.5 d for coorection of her vision_
a.what kind of defect in vision is she sufferin from .
b.what focal length and nature of lens.
c. Draw ray diagram showing the (a)defected eye (b)correction for this defect.
d.what are the causes of this defect.

Answer 1

a).noopur needs bi concave lens.she is suffering from myopia(short sightedness)

b).focal length=22.22cm biconcave lens