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The radii of curvature of the surfaces of a double convex lens are `20 cm and 30 cm`. What will be its focal length and power in air and water respect

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The radii of curvature of the surfaces of a double convex lens are `20 cm and 30 cm`. What will be its focal length and power in air and water respectively ? Refractive indices for glass and water are `3//2 and 4//3` respectively.
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1 Answer

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Correct Answer - `24 cm, 4.17 D`; `96 cm, 1.04 D`
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