A biconvex lens of refractive index 1.5 has a focal length of 20 ~cm in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

Optics: JEE Main 2024 Physics question

JEE Main 2024 · 29 Jan, Morning shift · Q7054

JEE Main 202429 Jan, Morning shiftPhysicsEasyOptics190× since 2002

A biconvex lens of refractive index 1.5 has a focal length of

20 \mathrm{~cm}

in air. Its focal length when immersed in a liquid of refractive index 1.6 will be:

JEE Main 2024 · 29 Jan, Morning shift · Q7054

JEE Main 202429 Jan, Morning shiftPhysicsEasyOptics190× since 2002

A biconvex lens of refractive index 1.5 has a focal length of

20 \mathrm{~cm}

in air. Its focal length when immersed in a liquid of refractive index 1.6 will be: