Inside a vessel filled with liquid a converging lens is placed as shown in figure. The lens has focal length…

Inside a vessel filled with liquid a converging lens is placed as shown in figure. The lens has focal length $15 \mathrm{~cm}$ when in air and has refractive index $\frac{3}{2}$. If the liquid has refractive index $\frac{9}{5}$, the focal length of lens in liquid is

1. $15 \mathrm{~cm}$
2. $-60 \mathrm{~cm}$
3. $90 \mathrm{~cm}$
4. $-45 \mathrm{~cm}$

Asked in: MHT CET 2021 (20 Sep Shift 1)

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