Without disturbing position of object,lens or screen,how can u get a sharp image of an object?

The image formed is not giving a sharp focus and we need to get a sharp image of the object without changing the positions of object, lens or screen. How can we do it?


My teacher asked me this question. Plz help!!!!Without disturbing position of object,lens or screen,how can u get a sharp image of an object?
Add another lens to the one that is there to focus.Without disturbing position of object,lens or screen,how can u get a sharp image of an object?
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