A point object is placed at a distance of \( 25 \mathrm{~cm} \) fro...

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A point object is placed at a distance of \( 25 \mathrm{~cm} \) from a convex lens of focal length \( 20 \mathrm{~cm} \). If a glass slab of thickness \( t \) and refractive index \( 1.5 \) is inserted between the lens and object. The image is formed at
\( \mathrm{P} \) infinity. Find the thickness \( t \) ?

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