A point object is placed at a distance of \( 25 \mathrm{~cm} \) from a convex lens of focal leng....

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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
\( \mathrm{P} \)
of thickness \( t \) and refractive index 1.5 is inserted between the lens and the object, the image is formed
W
at infinity. The thickness \( t \) is
(1) \( 10 \mathrm{~cm} \)
(2) \( 5 \mathrm{~cm} \)
(3) \( 20 \mathrm{~cm} \)
(4) \( 15 \mathrm{~cm} \)


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