Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of $15 cm$ 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. Is it true that , to obtain a sharp image of the building she will move the screen away from the lens ?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
The lens used is convex since the image created is real. When an object is farther away from a convex lens, the real image generated by the lens is farther away—because of this, moving the screen close to the lens is necessary to get a clear image of the structure.
The correct statement would be that Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens. She now tries to focus on the building visible to her outside the window instead of the window pane without disturbing the lens to obtain a sharp image of the building. She will move the screen close to the lens.

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