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4. A lens has a convex surface with radius of 20 cm and concave surface with a radius of 40 cm. This is made of

4. A lens has a convex surface with radius of 20 cm and concave surface with a radius of 40 cm. This is made of glass of refractive index 1.54. Compute the focal length of the lens, and identify whether it is converging or diverging lens

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