CUET · PHYSICS · PYQ PAPER 2023
If the least distance of distinct vision for a person is 50 cm, what should be the focal length of the reading spectacles for him ?
- A - 16.7 cm
- B + 16.7 cm
- C - 50 cm
- D + 50 cm
Answer & Solution
Correct Answer
(D) + 50 cm
Step-by-step Solution
Detailed explanation
\( u = -25 \text{ cm}, v = -50 \text{ cm} \) \( \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \) \( \frac{1}{f} = \frac{1}{-50} - \frac{1}{-25} = \frac{-1+2}{50} = \frac{1}{50} \) \( f = +50 \text{ cm} \)
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