CUET · PHYSICS · PYQ PAPER 2023
The radii of curvature of a double convex lens are 15 cm and 10 cm and its refractive index is 1.3. Its focal length will be:
- A -10 cm
- B +10 cm
- C +20 cm
- D +12.5 cm
Answer & Solution
Correct Answer
(C) +20 cm
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (n-1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{f} = (1.3-1) \left( \frac{1}{15} - \frac{1}{-10} \right) \) \( \frac{1}{f} = (0.3) \left( \frac{1}{15} + \frac{1}{10} \right) \) \( \frac{1}{f} = (0.3) \left( \frac{2+3}{30} \right) \)…
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