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A meniscus lens have convex surface of curvature 20 cm and concave surface 30 cm...

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A meniscus lens have convex surface of curvature 20 cm and concave surface 30 cm If the lens is constructed of glass u 1 5 the focal length will be 1 4 cm 3 120 cm 2 4cm 4 120 cm l length

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