A person needs a lens of power –4.5 D for correction of her vision. (a) What kind of defect in vision is she suffering from?
A person needs a lens of power –4.5 D for correction of her vision. (a) What kind of defect in vision is she suffering from?
Ans. Myopia
(b) What is the focal length of the corrective lens?
P= 1 / f or f= 1/ P
= -0.22 D
(c) What is the nature of the corrective lens?
Ans. The negative sign shows that it is a concave lens.
