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

Question

( A ) $f_2 > f$ and $f_1$ becomes negative
( B ) $f_1 > f$ and $f_2$ becomes negative
( C ) $f_1$ and $f_2$ both become negative
( D ) $f_1 = f_2 < f$