The far point of a myopic person is 80cm in front of the eye. what is the nature and power of the lens required to correct the problem?

The far point of a myopic person is 80cm in front of the eye. what is

1.	The far point of a myopic person is 80cm in front of the eye. what is the nature and power of the lens required to correct the problem?
Answer» Solution :The person is suffering fi·orn an eye defect called myopia.In this defect, the image is formed in front of the retina. Hence, a concave lens is used to correct this defect of vision. Image distance , v=80cm, Focal length = F According to thelens formula `(1)/(v)-(1)/(U)=(1)/(f)` `-(1)/(80)-(1)/(OO)=(1)/(f)` `(1)/(f)=-(1)/(80)` F=80cm=0.8m We KNOW Power `p=(1)/(f("inmeters"))` ` p=(1)/(-0.8)=1.25D` A concave lens of power 1.25D is required by the person to CORECT his defect