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Human Eye and Colourful World — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHuman Eye and Colourful World1 Mark
MCQ
A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power :
  • A
    $+\ 0.5D$
  • ✓
    $-\ 0.5D$
  • C
    $+\ 0.2D$
  • D
    $-\ 0.2D$
✓

Answer

Correct option: B.
$-\ 0.5D$
This person is suffering from myopia. He needs a concave lens and hence power would be in negative.
$\text{P}=\frac{1}{\text{f}}=\frac{1}{2\text{m}}=0.5\text{D}$

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