AP EAMCET · PHYSICS · Ray Optics
If the least distance of distinct vision for a boy is 35 cm, then the lens to be used by the boy for correcting the defect of his eye is
- A convex lens of focal length 35 cm
- B concave lens of focal length 35 cm
- C convex lens of focal length 87.5 cm
- D concave lens of focal length 87.5 cm
Answer & Solution
Correct Answer
(C) convex lens of focal length 87.5 cm
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \) \( \frac{1}{f} = \frac{1}{-35 \text{ cm}} - \frac{1}{-25 \text{ cm}} \) \( \frac{1}{f} = \frac{-25 + 35}{875} = \frac{10}{875} \) \( f = \frac{875}{10} = 87.5 \text{ cm} \) convex lens of focal length 87.5 cm
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