Question

A person cannot see objects clearly beyond $2.0m$. The power of lens required to correct his vision will be

• A. $+2.0D$
• B. $-1.0D$
• C. $+1.0D$
• D. $-0.5D$

Answer 1

Answer: (D)

$-0.5D$

As we know,

$P=\frac{1}{f}=\frac{1}{-\left(defectedfarpoint\right)}=-\frac{1}{2}=-0.5D$