For a convex lens the screen is placed 20cm behind the lens to obtain a clear image of a distant object. A second convex lens is placed alongwith first lens.Now where the screen should be placed at to obtain a clear image of the object?

power of the each lens = p = 1f = 10020  = 5 Dnet power of the system = 5+5 = 10 Dnet focal length = f = 100P =10010= 10 cmscreen should be placed at 10 cm behind the lens.

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