Question

A nearsighted person cannot see objects clearly beyond (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 ?

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Updated on : 2022-09-05
Solution
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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 
in this question and

power of a lens where f is in meter and is in Diopter.
so
power of lens , and sign signifies lens is diverging i.e concave lens

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