CUET · PHYSICS · PYQ PAPER 2025
The power of a biconvex lens is 12 D and the radius of curvature of each surface is 10 cm. The refractive index of the material of the lens is
- A 1.6
- B 1.5
- C 1.45
- D 1.875
Answer & Solution
Correct Answer
(A) 1.6
Step-by-step Solution
Detailed explanation
\( P = (n-1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( 12 = (n-1) \left( \frac{1}{0.1} - \frac{1}{-0.1} \right) \) \( 12 = (n-1) (10 + 10) \) \( 12 = (n-1) (20) \) \( n-1 = \frac{12}{20} = 0.6 \) \( n = 1.6 \)
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