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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

The radii of curvature of the two surfaces of a lens are cm and cm; and the refractive index of the material of the lens is . If the lens is concave-convex, then the focal length of the lens is

Answer: (D)

Solution

For a meniscus with radii 20 cm and 30 cm,

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Question ID VK-069384