Q. 264.0( 21 Votes )
To get a sharp image of the object, Sudha should move the screen towards the lens and keeping the lens fixed because the object is now placed at beyond 2f and the lens will form the image towards on opposite side between F and 2F.
Since the actual distance between the window pane and the mirror is 15 cm. So, the approximate focal length of the lens will be approximately 15 cm.
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