MCQ
A short sighted person can see distinctly only those objects which lie between $10\, cm$ and $100\, cm$ from him. The power of the spectacle lens required to see a distant object is
- A$+ 0.5\,D$
- ✓$-1.0\, D$
- C$-10\,D$
- D$+ 4.0\, D$
✓
Answer
Correct option: B.
$-1.0\, D$
b
(b) $f = - \;d = - \;100\;cm = - \;1\;m$
$\therefore P = \frac{1}{f} = \frac{1}{{ - 1}} = - \;1\;D$
(b) $f = - \;d = - \;100\;cm = - \;1\;m$
$\therefore P = \frac{1}{f} = \frac{1}{{ - 1}} = - \;1\;D$
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