A bi-convex lens is cut from the middle as shown in figure. Refractive index of material of lens is `(3)/(2)`. Now lens-1 (as shown in figure) is immersed in a liquid of refractive index `mu_(0)`. By doing so it is observed that its focal length becomes equal to lens-2. What is the value of `mu_(0)` ?
A. `1.3`
B. `1.1`
C. `1.4`
D. `1.2`