Total internal reflection can take place only if

The figure shows two rays $\mathrm{A}$ and $\mathrm{B}$ being reflected by a mirror and going as ${\mathrm{A}}^{\text{'}}$ and $\mathrm{B}\text{'}$. The mirror

Figure shows three transparent media of refractive indices ${\mathrm{\mu }}_1,{\mathrm{\mu }}_2$ and ${\mathrm{\mu }}_3.$ A point object $\mathrm{O}$ is placed in the medium ${\mathrm{\mu }}_2.$ If the entire medium on the right of the spherical surface has refractive index ${\mathrm{\mu }}_1,$ the image forms at ${\mathrm{O}}^{\text{'}}.$ If this entire medium has refractive index ${\mathrm{\mu }}_3,$ the image forms at ${\mathrm{O}}^{\text{'}\text{'}}.$ In the situation shown,