A thin lens of refractive index \( 1.5 \) has a focal length of \( 15 \mathrm{~cm} \) in air. Wh...

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A thin lens of refractive index \( 1.5 \) has a focal length of \( 15 \mathrm{~cm} \) in air. When the lens is placed in a medium of refractive index
\( \mathrm{P} \) \( 4 / 3 \), its focal length will become
(1987, 2M)
W)
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