An object is kept at a distance of \( 16 \mathrm{~cm} \) from a thin lens and the image formed i....

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An object is kept at a distance of \( 16 \mathrm{~cm} \) from a thin lens and the image formed is real. If the object is
\( \mathrm{P} \)
kept at a distance of \( 6 \mathrm{~cm} \) from the same lens, the image formed is virtual. If the sizes, of the images
W
formed are equal, the focal length of the lens (in cm) will be


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