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NEET · Physics · STD 12 - 9. Ray optics and optical instruments
A person can see clearly objects only when they lie between \(50\,\, cm\) and \(400\,\, cm\) from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be
- A concave,\(-0.25\) diopter
- B convex,\(+0.15 \) diopter
- C convex,\(+2.25 \) diopter
- D concave, \(-0.2\) diopter
Answer & Solution
Correct Answer
(A) concave,\(-0.25\) diopter
Step-by-step Solution
Detailed explanation
\(\text { Here, } u=400 \,\mathrm{cm}=4 \,\mathrm{m}, v=\infty, f=?\) Using lens formula, \(\frac{1}{v}-\frac{1}{u}=\frac{1}{f}\)
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