Question

A person can see objects clearly only upto a maximum distance of $60cm$. His eye defect, nature of the corrective lens and its focal length are respectively.

• A. Myopia, convex, $60cm$
• B. Myopia, concave, $60cm$
• C. Hypermetropia, concave, $60cm$
• D. Contract, convex, $60cm$

Answer 1

Answer: (B)

Myopia, concave, $60cm$

Range of vision for healthy eye is $25cm$ to $\infty$. If the person can see clearly only upto a maximum distance of $60cm$. He is suffering from myopia. A short sighted eye can see only nearer objects. This defect can be removed by using a concave lens of suitable focal length equal to maximum distance seen by person. $f=60cm$.