A point object is placed at 30 cm from a convex glass lens `(mu_(g)=(3)/(2))` of focal 20 cm. The final image of object will beformed at infinity if :

Options

A. Another concave lens of focal length 60 cm is placed in cotact with the previous lens
B. Another convex lens of focal legth 60 cm is placed at a distance of 30 from the first lens
C. The whole system is immersed in a liquid of refractive index 4/3
D. The whole system is immersed in liquid of refractive index 9/8