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A convex meniscus lens is made from glass with refractive index n = 1.52. If the radius of curvature of the convex surface is 20 cm and that of the concave surface is 40 cm, then find out the focal length.

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given, for convex part, radius of curvature, R1=20 cm

and for concave part, R2=-40 cm

and refractive index, µ=1.52

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