Question

For the myopic eye,the defect is cured by

• A. convex lens
• B. concave lens
• C. cylindrical lens
• D. toric lens

Answer 1

Answer: (B)

In myopia, $u=\infty ,v=d=$ distance of far point
By $\frac{1}{F}=\frac{1}{v}-\frac{1}{u}$, we get $f=-d$
Since $f$ is negative, hence the lens used is concave.