Answer:
Sudha should move the screen towards
the lens to obtain a sharp image of the building because window pane was lying
beyond focus 2F or centre of curvature and convex lens forms its image, on the
other side between F and 2F and when she tries to focus the building visible to
her outside the window (i.e., at distant object at infinity), then lens forms the
image of building at a distance of focal length.
The approximate focal length of this
lens is 15 cm.
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