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state two uses of concave and convex lens give two uses of concave and convex lens state any two uses of concave and convex lens class 10 list two uses each of concave and convex lenses give two uses each of concave and convex lens state two applications of convex and concave lens what are two devices that use combination of concave and convex lens write any two applications of both concave and convex lens state two uses of concave lens what are the applications of concave and convex lens
