A convex-concave lens has faces of radii 3.0 and 4.0 cm, respectively, and is made of glass

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A convex-concave lens has faces of radii 3.0 and 4.0 cm, respectively, and is made of glass of refractive index 1.6. Determine 

(a) Its focal length and 

(b) The linear magnification of the image when the object is 28 cm from the lens.

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