Two refracting media are separated by a spherical interfaces as shown in the figure. AB is the principal axis, `mu_1 and mu_2` are the refractive indices of medium of incidence and medium of refraction respectively. Then,
A. if `mu_(2)gtmu_(1)` , then there cannot be a real image of real object
B. if `mu_(2)gtmu_(1)` , then there cannot be a real image of virtual object
C. if `mu_(1)gtmu_(2)` , then there cannot be a virtual image of virtual object
D. if `mu_(1)gtmu_(2)` , then there cannot be a real image of real object