Some one with a near point of \( 25 \mathrm{~cm} \) views a thimble through a simple magnifying ...

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Some one with a near point of \( 25 \mathrm{~cm} \) views a thimble through a simple magnifying lens of focal length \( 10 \mathrm{~cm} \) by placing the lens near his eye. What is the angular magnification of the thimble if it is positioned
\( P \) so that its image appears at (a) near point and (b) infinity?

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