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[" 21.Lenses of powers "3D" and "-5D" ar...

[" 21.Lenses of powers "3D" and "-5D" are combined to from "],[" a compound lens.An object is placed at a distance "],[" of "50cm" from this lens.Calculate the position of its "],[" image."],[[" (A) "-10cm," (B) "+10cm],[" (C) "-25cm," (D) "+25cm]]

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