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• aru upucal Instruments 38 32. For a plano convex lens of material refractive index u the curved surface of radius of curvature R has been silvered as shown. It behaves like a concave mirror of effective focal length 39 (1) 2(u-1) (2) Zu R R. (3) 4u-2 (4) 2(u +1) Ahiconvay lens has focal length 20 cm in air Its

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