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[" 6.Sudha finds out that the sharp imag...

[" 6.Sudha finds out that the sharp image of the window pane of her "],[" science laboratory is formed at a distance of "15cm" from the lens."],[" She now tries to focus the building visible to her outside the window "],[" instead of the window pane without disturbing the lens.In which "],[" direction will she move the screen to obtain a sharp image of the "],[" building? What is the approximate focal length of this lens? "]

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