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,

Options

A. If `mu_2gtmu_1,` then there cannot be a real image of real object
B. If `mu_2gtmu_1,` then there cannot be a real image of virtual object
C. If `mu_1gtmu_2,` then there cannot be a real image of virtual object
D. If `mu_1gtmu_2,` then there cannot be a virtual image of virtual object

Answer

D

Explanation

`mu_2/v-mu_1/u=(mu_2-mu_1)/(-R)`
`:. mu_2/v=(mu_1-mu_2)/R+mu_1/u`
If `mu_1gtmu_2`and u is positive (i.e. virtual object),
then v is always positve or image is always real.