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A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well

lit distant object (preferably the sun) should be focussed on the screen. What should be done for th


You havent asked the full question
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I think the question is incomplete .However we could obtain the sharp image of sun when the same experiment is conducted on a terrace/open place.
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