Question

A short sighted person can see distinctly only those objects which lie between $10cm$ and $100cm$ from him, The power of the spectacle lens required to see a distance object is

• A. $+0.5D$
• B. $-1.0D$
• C. $-10D$
• D. $+4.0D$

Answer 1

Answer: (B)

$-1.0D$

Given

$f=-d=-100cm=-1m$
$\therefore P=\frac{1}{f}=\frac{1}{-1}=-1D$