Sudha finds out 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 buildings 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 ?

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Towards the lens

Away from the lens

Inverted from the lens

At the focus of the lens

answer is A.

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Detailed Solution

To obtain a sharp image of the building instead of the window pane, Sudha will have to move the screen slightly towards the lens.
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.

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