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JEE Main 2024 Physics question

PhysicsRay Optics and Optical InstrumentsJEE Main 2024

For the thin convex lens, the radii of curvature are at 15 cm and 30 cm respectively. The focal length of the lens is 20 cm. The refractive index of the material is:

Answer: (C)

Solution

1/f = (μ − 1)(1/15 + 1/30) = (μ − 1)/10 = 1/20 ⇒ μ = 1.5.

Question ID VK-012067