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The focal length of a bi-convex lens is 20 cm and its refractive index is 1.5. If the radii of curvatures of two surfaces of lens are in the ratio 1:2, then the value of the larger radius of curvature is:(in cm) |
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Answer» The focal length of a bi-convex lens is 20 cm and its refractive index is 1.5. If the radii of curvatures of two surfaces of lens are in the ratio 1:2, then the value of the larger radius of curvature is: |
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