A thin convex lens made from crown glass (μ=3/2) has focal length f. When it is measured in two different liquids having refractive indices 4/3 and…

A thin convex lens made from crown glass $\displaystyle \left(\mu=\frac{3}{2}\right)$ has focal length $\displaystyle f$. When it is measured in two different liquids having refractive indices $\displaystyle \frac{4}{3}$ and $\displaystyle \frac{5}{3}$, it has the focal lengths $\displaystyle f_1$ and $\displaystyle f_2$ respectively. The correct relation between the focal lengths is :