An object \( 4 \mathrm{~cm} \) high is placed \( 25 \mathrm{~cm} \) in front of a concave mirror...

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An object \( 4 \mathrm{~cm} \) high is placed \( 25 \mathrm{~cm} \) in front of a concave mirror of focal length \( 15 \mathrm{~cm} \). At what distance from the mirror should a screen be placed to obtain a -sharp image? Find the nature and size of the image.
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