A nearsighted person cannot see objects clearly beyond 25.0cm (her far point). If she has no astigmatism and contact lenses are prescribed for her, -'what power and type of lens are required to correct her vision ?
Open in App
Updated on : 2022-09-05
Verified by Toppr
Correct option is A)
Nearsighted person has myopia.
Given far point =25.0 cm, to correct vision we need to shift far point at infinity.
See diagram, using lens formula
f1=v1−u1 in this question u=−25cm and v=∞
power of a lens P=f1 where f is in meter and P is in Diopter.
power of lens 4D, and −sign signifies lens is diverging i.e concave lens