STANDARD Physics Lenses MCQ Question
Radii of curvature of a converging lens are in the ratio 1 : 2. Its focal length is 6 cm and refractive index is 1.5. Then its radii of curvature are
9 cm and 18 cm
6 cm and 12 cm
3 cm and 6 cm
4.5 cm and 9 cm
Correct Answer
Detailed Explanation
Using the lens maker's formula: 1/f = (μ - 1)(1/R₁ - 1/R₂). Given f = 6 cm, μ = 1.5, R₁ = R, R₂ = -2R. Solving gives R₁ = 4.5 cm, R₂ = 9 cm.
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