A conversing lens has a focal length of $20 c m$ in air. It is made of a material of refractive index $1.6$ . If it is immersed in a liquid of refractive index $1.3$ , find the new focal length.

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A conversing lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. If it is immersed in a liquid of refractive index 1.3, find the new focal length.

A conversing lens has a focal length of $20 c m$ in air. It is made of a material of refractive index $1.6$ . If it is immersed in a liquid of refractive index $1.3$ , find the new focal length.