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A convex meniscus lens is made from glass with refractive index n 1 52 If...

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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 A 129 cm B 94 cm C 80 cm D 113 cm

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